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Logic Games: Grouping and Selection Games Flashcards

7 cards from real LSAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A committee of exactly 3 must be chosen from 6 candidates: F, G, H, J, K, L. If F is selected, then G must also be selected. If G is selected, then H cannot be selected. Which group is an acceptable committee?

    Answer: F, G, J

    F and G can serve together as long as H is excluded; F, G, J satisfies both constraints.

  2. In a grouping game where exactly 3 items are placed in Group 1 and exactly 2 in Group 2, a contrapositive is most useful when:

    Answer: A conditional rule has a known false consequent

    The contrapositive fires when the consequent is false, letting you conclude the antecedent is also false.

  3. Seven volunteers—1, 2, 3, 4, 5, 6, 7—are split into Team A (4 members) and Team B (3 members). Volunteer 3 and Volunteer 5 cannot be on the same team. If Volunteer 3 is on Team A, which of the following MUST be true?

    Answer: Volunteer 5 is on Team B

    Because 3 and 5 cannot share a team and 3 is on Team A, 5 must be on Team B.

  4. In a selection game, which deduction technique is most efficient when two items are linked by an 'if and only if' (biconditional) rule?

    Answer: Treat the biconditional as two separate one-way conditionals

    A biconditional (A↔B) means A→B AND B→A; treating it as two conditionals captures all inferences.

  5. A selection game requires choosing 4 from {M, N, O, P, Q, R}. The rule states: 'If M is not chosen, then both P and Q must be chosen.' If P is not chosen, what can be concluded?

    Answer: M must be chosen

    Via contrapositive of the rule (not-P or not-Q → M), since P is not chosen, M must be chosen.

  6. In a grouping game, 'at least one of A or B must be in Group X' is best represented as:

    Answer: not A → B

    'At least one of A or B' means if A is absent then B must be present: not-A → B.

  7. Eight employees are divided into exactly two groups of 4. Employee T and Employee V must be in the same group. Employee V and Employee W cannot be in the same group. If T is in Group 1, which must be true?

    Answer: W is in Group 2

    T is in Group 1, so V (who must be with T) is in Group 1, and W (who cannot be with V) must be in Group 2.