JD Juris Doctor: Logical Reasoning 4 — Questions and Answers
Question 1: In IRAC legal writing, the 'A' (Application) step fails when a student:
- States the legal rule clearly
- Merely restates the facts without connecting them to the rule's elements (Correct answer)
- Identifies the governing statute
- Cites the most recent case authority
Correct answer: Merely restates the facts without connecting them to the rule's elements
A weak application just lists facts rather than explaining how each fact satisfies or fails to satisfy each element of the legal rule.
Question 2: Syllogism: 'All intentional torts require intent. Battery is an intentional tort. Therefore, battery requires intent.' What is the logical form of this argument?
- Hypothetical syllogism
- Disjunctive syllogism
- Categorical syllogism (Barbara form) (Correct answer)
- Modus tollens
Correct answer: Categorical syllogism (Barbara form)
This is a categorical syllogism in Barbara (AAA-1) form: All M are P; All S are M; therefore All S are P.
Question 3: A court distinguishes a prior case by noting that in the prior case the defendant had actual knowledge, whereas here the defendant only had constructive knowledge. This distinction is logically relevant only if:
- Both cases arise in the same jurisdiction
- Actual versus constructive knowledge is a material element affecting the legal outcome (Correct answer)
- The prior case was decided by a higher court
- The statute uses the word 'knowledge' at least once
Correct answer: Actual versus constructive knowledge is a material element affecting the legal outcome
A factual distinction justifies different outcomes only when the difference is legally material—i.e., it changes which rule applies or how it applies.
Question 4: An attorney argues: 'My client should win because the other side's lead counsel was once sanctioned for discovery abuse in an unrelated case.' This is an example of:
- Ad hominem (circumstantial) fallacy (Correct answer)
- Slippery slope fallacy
- False dilemma
- Appeal to authority
Correct answer: Ad hominem (circumstantial) fallacy
Attacking opposing counsel's character rather than the merits of the legal argument is an ad hominem fallacy.
Question 5: Which logical relationship is captured by the phrase 'necessary and sufficient condition'?
- P is required for Q but Q can occur without P
- P guarantees Q and Q cannot occur without P (biconditional: P if and only if Q) (Correct answer)
- P makes Q more probable but does not guarantee it
- P and Q are mutually exclusive
Correct answer: P guarantees Q and Q cannot occur without P (biconditional: P if and only if Q)
A condition that is both necessary and sufficient creates a biconditional: P ↔ Q, meaning each is required for and guaranteed by the other.
Question 6: A legislature passes a law: 'Persons convicted of fraud shall be ineligible for public office.' A person is ineligible for public office. A court reasoning backwards might conclude she was convicted of fraud. What is the logical error?
- Modus ponens
- Denying the antecedent
- Affirming the consequent (Correct answer)
- Modus tollens
Correct answer: Affirming the consequent
Affirming the consequent is the fallacy of inferring the antecedent from the consequent: 'If P then Q; Q; therefore P'—which is invalid.
Question 7: In a contract dispute, the parol evidence rule logically functions as a:
- Rule of relevance that excludes logically irrelevant prior negotiations
- Rule of completeness that requires all prior terms to be included
- Exclusionary rule that prevents prior or contemporaneous oral agreements from contradicting an integrated written contract (Correct answer)
- Canon of construction favoring the drafter
Correct answer: Exclusionary rule that prevents prior or contemporaneous oral agreements from contradicting an integrated written contract
The parol evidence rule bars extrinsic evidence of prior or contemporaneous agreements that would contradict or vary the terms of a fully integrated written contract.
JD Juris Doctor: Logical Reasoning 4
In IRAC legal writing, the 'A' (Application) step fails when a student: