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  2. LSAT — Logical Reasoning & Reading Comprehension
  3. Conditional Logic: Sufficient, Necessary & Contrapositives
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LSAT — Logical Reasoning & Reading Comprehension

The reasoning skills the modern LSAT actually scores: argument anatomy, conditional logic, named flaws, the strengthen/weaken/assumption family, inference and principle questions, and reading comprehension including comparative passages. No logic games — Analytical Reasoning is no longer on the test.

Law
NShared by Nadia Osei
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Conditional Logic: Sufficient, Necessary & Contrapositives

Translating if, only if and unless, taking contrapositives, spotting mistaken reversals and negations, and handling the quantifiers some, most and all.

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Content

43 total questions

MCQ: 10
Fill-in: 9
Flashcards: 14
Pair match: 10
Conditional Logic: Sufficient, Necessary & Contrapositives – Flashcards
Flashcards

Card #1

Sufficient condition

Card #2

Necessary condition

Card #3

Contrapositive

11 more questions in this game

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Conditional Logic: Sufficient, Necessary & Contrapositives – MCQ
Multiple Choice Questions
  1. 1. 'You may enter only if you have a ticket.' Which is the correct translation?

    • If you enter, then you have a ticket
    • If you have a ticket, then you may enter
    • If you do not enter, then you do not have a ticket
    • If you have no ticket, you may still enter
  2. 2. The contrapositive of 'If the alarm sounds, the doors lock' is:

    • If the doors do not lock, the alarm did not sound
    • If the doors lock, the alarm sounded
    • If the alarm does not sound, the doors do not lock
    • If the doors do not lock, the alarm sounded
  3. 3. 'The plant will die unless it is watered' translates to:

    • If the plant is not watered, it will die
    • If the plant is watered, it will not die
    • If the plant dies, it was not watered
    • If the plant is watered, it will die
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Conditional Logic: Sufficient, Necessary & Contrapositives – Fill-in-the-blank
Fill in the Blank
  1. 1. In 'If A, then B', A is the ___ condition.

    Answer:sufficient

    Hint: the trigger

  2. 2. In 'If A, then B', B is the ___ condition.

    Answer:necessary

    Hint: the requirement

  3. 3. Negating both terms and reversing them produces the ___.

    Answer:contrapositive

    Hint: logically identical to the original

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Conditional Logic: Sufficient, Necessary & Contrapositives – Pair match
Pair Match
If↔Introduces the sufficient condition
Only if↔Introduces the necessary condition
Unless↔Negate it and make it the trigger
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