LSAT Logic Games: Grouping and Selection Games 2

Question 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?

Accepted Answer

F, G, J

Answer

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

Question 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:

Accepted Answer

A conditional rule has a known false consequent

Answer

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

Question 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?

Accepted Answer

Volunteer 5 is on Team B

Answer

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

Question 4

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

Accepted Answer

Treat the biconditional as two separate one-way conditionals

Answer

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

Question 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?

Accepted Answer

M must be chosen

Answer

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

LSAT - Law School Admission Test Practice Test

LSAT - Law School Admission Test Practice Test

LSAT Logic Games: Grouping and Selection Games 2