BJMP Entrance Exam Analytical Ability — Logical ReasoningMisconception Buster
Avoid the most common Logical Reasoning mistakes made by BJMP Entrance Exam reviewers. Each misconception here has been pulled from real BJMP Entrance Exam Analytical Ability questions where Bureau of Jail Management and Penology (BJMP) used it to separate strong reviewers from weak ones. Learn these before your next mock.
Exam context
For the Bureau of Jail Management and Penology Entrance Examination, Bureau of Jail Management and Penology (BJMP) tests Analytical Ability under a "Core" label, with Logical Reasoning in the 7th slot across 7 chapters. BJMP Entrance Exam candidates must clear the BJMP-set percentile cut on the 2026 paper, which draws about a meaningful share of Analytical Ability questions. Date to watch: Announced by BJMP per cycle.
Logical Reasoning - Misconception buster
Logical reasoning is one of the most deceptive topics in the CSE Professional exam. Students often feel confident about their answers but make fundamental errors that cost precious marks. These misconceptions are particularly dangerous because they feel 'logical' but are actually wrong. Understanding where your thinking goes astray is crucial for exam success, as logical reasoning questions can make or break your overall score.
Summary
The key to avoiding these misconceptions is to separate logical analysis from personal knowledge and real-world experience. Always focus on the structure of arguments rather than the content. Remember that validity is about logical necessity, not truth or personal agreement. Practice identifying the difference between what sounds right and what logically follows. Most importantly, slow down and systematically work through each step rather than relying on intuition, as logical reasoning often contradicts our natural thinking patterns.
Misconceptions
If the conclusion sounds reasonable in real life, then the logical argument is valid
Tags
- common_error
- validity_confusion
- real_world_interference
Topic
Argument Validity
Severity
critical
Exam Impact
Students consistently choose wrong answers because they evaluate based on real-world knowledge instead of logical structure, losing 3-5 marks per section
The Reality
In logical reasoning, validity depends ONLY on the structure of the argument, not on whether the conclusion is true in reality. An argument can be logically invalid even if the conclusion happens to be true in real life
Trap Question
Question
All Filipinos are humans. Jose is a Filipino. Therefore, Jose can breathe. Is this argument valid?
Explanation
While the conclusion is true in reality, it doesn't follow logically from the given premises. The premises only establish that Jose is human, not that he can breathe
Wrong Answer
Valid, because all Filipinos can indeed breathe and Jose being Filipino means he can breathe
Correct Answer
Invalid, because 'Jose can breathe' does not logically follow from the premises. The correct conclusion should be 'Jose is human'
Misconception Id
M1
Correct Vs Incorrect
Correct Approach
Ignoring personal knowledge completely and checking if the conclusion MUST follow from the premises based purely on logical structure
Incorrect Approach
Reading the premises and conclusion, then asking 'Does this make sense in real life?' and choosing based on common knowledge
Why Students Believe It
Students use their personal knowledge and common sense instead of focusing purely on the logical structure. They think 'This makes sense in the real world, so it must be correct'
In deductive reasoning, if the premises are false, the argument is automatically invalid
Tags
- validity_confusion
- premise_evaluation
- logical_structure
Topic
Deductive Arguments
Severity
critical
Exam Impact
Students incorrectly reject valid arguments with false premises, missing 2-4 marks on deductive reasoning questions
The Reality
Validity only concerns whether the conclusion follows from the premises. An argument can be valid even with completely false premises, as long as IF the premises were true, the conclusion would necessarily follow
Trap Question
Question
All birds are purple. All purple things can fly. Therefore, all birds can fly. Is this argument valid?
Explanation
Even though 'all birds are purple' is false in reality, the argument structure is valid. If the premises were true, the conclusion would have to be true
Wrong Answer
Invalid, because birds are not actually purple in real life
Correct Answer
Valid, because if we assume the premises are true, the conclusion necessarily follows
Misconception Id
M2
Correct Vs Incorrect
Correct Approach
Assuming the premises are true (even if they're not) and checking if the conclusion must follow from that assumption
Incorrect Approach
Checking if premises are true in real life first, then rejecting the argument if any premise is false
Why Students Believe It
Students confuse 'validity' with 'soundness' and think that false premises always make an argument invalid
'Some' means exactly half or a small portion of the group
Tags
- quantifier_confusion
- some_interpretation
- venn_diagrams
Topic
Categorical Statements
Severity
major
Exam Impact
Students make wrong inferences in Venn diagram problems and categorical syllogisms, losing 2-3 marks per question
The Reality
In formal logic, 'some' means 'at least one, possibly all'. When we say 'Some X are Y', it could mean anywhere from one to all members of X
Trap Question
Question
Some students are intelligent. All students in this class are students. Can we conclude that all students in this class are intelligent?
Explanation
'Some students are intelligent' allows for the possibility that ALL students are intelligent, so we cannot rule out that all students in this class are intelligent
Wrong Answer
No, because 'some' means only a few students are intelligent
Correct Answer
Cannot be determined, because 'some' could mean all students are intelligent
Misconception Id
M3
Correct Vs Incorrect
Correct Approach
Understanding that 'Some Filipinos are doctors' means 'At least one Filipino is a doctor, and possibly all Filipinos are doctors'
Incorrect Approach
Interpreting 'Some Filipinos are doctors' as 'Only a few Filipinos are doctors, definitely not all'
Why Students Believe It
Students interpret 'some' based on everyday language where it often implies 'not all' or 'a few'
In conditional statements, if the condition is false, the whole statement is false
Tags
- conditional_logic
- if_then_statements
- logical_fallacy
Topic
Conditional Syllogism
Severity
major
Exam Impact
Students make errors in conditional reasoning questions, especially when working backwards from conclusions, losing 2-3 marks
The Reality
A conditional statement 'If P then Q' is only false when P is true and Q is false. If P is false, the conditional statement is automatically true regardless of Q
Trap Question
Question
If Maria studies hard, she will pass the exam. Maria did not study hard. Therefore, Maria will not pass the exam. Is this reasoning correct?
Explanation
The conditional only tells us what happens if she studies hard. It doesn't tell us what happens if she doesn't study hard - she might still pass for other reasons
Wrong Answer
Yes, because if she didn't meet the condition (studying hard), she won't get the result (passing)
Correct Answer
No, this is invalid reasoning. Maria could still pass through other means
Misconception Id
M4
Correct Vs Incorrect
Correct Approach
Understanding the statement is only false if it rains AND you don't bring an umbrella. On sunny days, the statement is automatically true
Incorrect Approach
Thinking 'If it rains, I will bring an umbrella' is false on sunny days because it didn't rain
Why Students Believe It
Students think that 'If P then Q' requires P to be true for the statement to hold
Inductive arguments can be valid or invalid just like deductive arguments
Tags
- argument_types
- inductive_reasoning
- terminology_error
Topic
Inductive Arguments
Severity
major
Exam Impact
Students use wrong terminology and evaluation criteria for inductive reasoning questions, losing 1-2 marks per question
The Reality
Inductive arguments are evaluated as strong or weak, not valid or invalid. They deal with probability and likelihood, not absolute logical necessity
Trap Question
Question
The first 10 swans I saw were white. The next 5 swans were also white. Therefore, all swans are probably white. Is this argument valid?
Explanation
Inductive arguments move from specific observations to general conclusions and deal with probability. We evaluate them as strong/weak, not valid/invalid
Wrong Answer
Yes, it's valid because the premises strongly support the conclusion
Correct Answer
The question is inappropriate - inductive arguments are not valid or invalid, but strong or weak. This is a strong inductive argument
Misconception Id
M5
Correct Vs Incorrect
Correct Approach
Evaluating inductive arguments as 'strong' when premises make the conclusion likely, or 'weak' when they don't
Incorrect Approach
Calling an inductive argument 'valid' when the conclusion is well-supported by premises
Why Students Believe It
Students apply the same evaluation criteria to both deductive and inductive arguments
In Venn diagrams, overlapping areas must always contain some elements
Tags
- venn_diagrams
- set_relationships
- visual_reasoning
Topic
Venn Diagrams
Severity
major
Exam Impact
Students make wrong conclusions about set relationships and categorical statements, losing 2-3 marks on diagram-based questions
The Reality
Venn diagram structure shows possible relationships, not required memberships. An overlapping area might be empty unless specifically stated otherwise
Trap Question
Question
Some Filipinos are engineers. Some engineers are managers. Therefore, some Filipinos are managers. Is this conclusion correct?
Explanation
Just because some Filipinos are engineers and some engineers are managers doesn't guarantee any Filipino is a manager. The two 'some' groups might not overlap
Wrong Answer
Yes, because the Venn diagrams overlap, so there must be Filipinos who are managers
Correct Answer
No, this conclusion is not necessarily correct. The overlaps might not intersect
Misconception Id
M6
Correct Vs Incorrect
Correct Approach
Understanding the overlap shows the possibility of doctor-teachers, but additional information is needed to confirm actual members exist there
Incorrect Approach
Seeing overlapping circles for 'Some doctors are teachers' and concluding there definitely are doctor-teachers
Why Students Believe It
Students assume that if two circles overlap in a diagram, there must be actual members in that intersection
Arguments with true conclusions are automatically good arguments
Tags
- argument_strength
- conclusion_bias
- evaluation_criteria
Topic
Argument Evaluation
Severity
major
Exam Impact
Students accept weak arguments with agreeable conclusions and reject strong arguments with disagreeable ones, losing 1-2 marks per evaluation question
The Reality
A good argument requires both valid reasoning AND true premises. A true conclusion reached through faulty reasoning is still a bad argument
Trap Question
Question
Most CSE examinees are nervous. Juan is a CSE examinee. Therefore, Juan is nervous. Evaluate this argument.
Explanation
Even if the premise is true, 'most' means Juan could be in the minority who aren't nervous. The reasoning doesn't strongly support the conclusion
Wrong Answer
Good argument, because most examinees really are nervous and Juan probably is too
Correct Answer
This is a weak inductive argument because 'most' doesn't guarantee Juan is in that majority
Misconception Id
M7
Correct Vs Incorrect
Correct Approach
Rejecting the argument because the first premise is an unfair generalization, even if you happen to agree with the conclusion
Incorrect Approach
Accepting 'All politicians are corrupt. Duterte is a politician. Therefore, Duterte is corrupt' because you believe the conclusion
Why Students Believe It
Students focus on whether they agree with the conclusion rather than evaluating the reasoning process
Disjunctive syllogism works with inclusive OR (both options can be true)
Tags
- disjunctive_reasoning
- exclusive_or
- logical_operations
Topic
Disjunctive Syllogism
Severity
minor
Exam Impact
Students make incorrect eliminations in either/or scenarios, losing 1-2 marks on disjunctive reasoning questions
The Reality
Disjunctive syllogism requires exclusive OR - only one of the options can be true. If both could be true, eliminating one doesn't guarantee the other
Trap Question
Question
The food is either spicy or delicious. The food is not delicious. Therefore, the food is spicy. Is this reasoning correct?
Explanation
The reasoning is only valid if the original statement uses exclusive OR. In everyday language, 'either/or' can be inclusive, making this reasoning potentially invalid
Wrong Answer
Yes, if it's not delicious, it must be spicy based on the either/or statement
Correct Answer
Only correct if 'either/or' is exclusive. If inclusive, the food could be both or neither
Misconception Id
M8
Correct Vs Incorrect
Correct Approach
Recognizing when OR is exclusive (only one true) vs inclusive (both could be true) before applying elimination
Incorrect Approach
Treating 'The student is either hardworking or intelligent' as allowing both qualities, then incorrectly eliminating
Why Students Believe It
Students don't distinguish between exclusive and inclusive OR in logical contexts
Ordering problems can be solved by just arranging people randomly until it works
Tags
- ordering_problems
- systematic_thinking
- constraint_analysis
Topic
Ordering and Arrangements
Severity
minor
Exam Impact
Students waste time and often get wrong answers on ordering questions, losing 1-2 marks and precious exam time
The Reality
Ordering problems require systematic analysis of each constraint and building the solution step by step using elimination and deduction
Trap Question
Question
Five students A, B, C, D, E are in a line. A is not first. B is between A and C. D is immediately after C. E is not last. Who is first?
Explanation
Working through constraints: A not first, E not last, B between A and C with D after C creates only one valid arrangement: E-A-B-C-D
Wrong Answer
B, because B is between others so seems like a middle position
Correct Answer
E, through systematic elimination of constraints
Misconception Id
M9
Correct Vs Incorrect
Correct Approach
Starting with the most restrictive condition, placing that person first, then systematically adding others based on remaining constraints
Incorrect Approach
Randomly placing Ana, Ben, Carlo in different positions and checking if all conditions are met
Why Students Believe It
Students avoid systematic thinking and try to guess-and-check instead of using logical deduction
Assumptions are always explicitly stated in the argument
Tags
- hidden_premises
- assumption_identification
- argument_analysis
Topic
Assumptions in Arguments
Severity
minor
Exam Impact
Students miss assumption-based questions and fail to identify weak points in arguments, losing 1-2 marks on assumption identification
The Reality
Assumptions are unstated premises that must be true for the argument to be valid. They are hidden but essential parts of the reasoning
Trap Question
Question
Maria got high grades in math. She will definitely succeed in engineering. What assumption is being made?
Explanation
The argument assumes that performance in math directly predicts engineering success, ignoring other factors like creativity, teamwork, and practical skills
Wrong Answer
No assumptions - it's clearly stated that good math grades lead to engineering success
Correct Answer
The assumption is that math ability is the key factor for engineering success
Misconception Id
M10
Correct Vs Incorrect
Correct Approach
Asking 'What must also be true, even though unstated, for this conclusion to follow from these premises?'
Incorrect Approach
Looking only at stated premises and conclusion, saying 'There are no assumptions here'
Why Students Believe It
Students look only at what is directly written and miss unstated premises that are crucial for the argument to work
Quick Self Check
A good argument needs both valid reasoning and true premises. You can reach a true conclusion through faulty reasoning
Statement
An argument with a true conclusion is always a good argument
Unlike everyday language, logical 'some' includes the possibility that all members have the stated property
Statement
In logic, 'some' means at least one and possibly all
Validity depends only on logical structure. An argument can be valid even with false premises
Statement
If the premises of a deductive argument are false, the argument is invalid
Inductive reasoning deals with probability and likelihood, so we use different evaluation terms
Statement
Inductive arguments should be evaluated as strong or weak, not valid or invalid
This commits the fallacy of denying the antecedent. The conditional doesn't tell us what happens when it's not raining
Statement
If it's raining, then I'll bring an umbrella. It's not raining, so I won't bring an umbrella
Overlaps show possible relationships, not guaranteed memberships. Additional information is needed
Statement
In Venn diagrams, overlapping areas must contain actual members
Logical evaluation should focus purely on the structure of the argument, not real-world knowledge
Statement
Personal knowledge should be used to evaluate logical arguments
Assumptions are unstated premises that are essential for the argument but not explicitly mentioned
Statement
Assumptions in arguments are always clearly stated
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