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14 Jun 2021, 09:00
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
42% (02:13) correct
58%
(02:18)
wrong
based on 168
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Wendy, a student, is an avid backgammon player. All students play either chess or checkers, but some checkers players do not play chess because they do not understand chess strategy. Backgammon players never play checkers, because they do not find checkers challenging. Therefore, Wendy must understand chess strategy.
Which of the following must be true for the conclusion drawn above to be logically correct?
(A) All chess players understand chess strategy.
(B) Backgammon is more challenging than checkers.
(C) All students who understand chess strategy play chess.
(D) Chess is more challenging than backgammon.
(E) All students who find backgammon challenging play checkers.
Which of the following must be true for the conclusion drawn above to be logically correct?
(A) All chess players understand chess strategy.
(B) Backgammon is more challenging than checkers.
(C) All students who understand chess strategy play chess.
(D) Chess is more challenging than backgammon.
(E) All students who find backgammon challenging play checkers.
19 Jun 2021, 09:00
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Bunuel
Wendy, a student, is an avid backgammon player. All students play either chess or checkers, but some checkers players do not play chess because they do not understand chess strategy. Backgammon players never play checkers, because they do not find checkers challenging. Therefore, Wendy must understand chess strategy.
Which of the following must be true for the conclusion drawn above to be logically correct?
(A) All chess players understand chess strategy.
(B) Backgammon is more challenging than checkers.
(C) All students who understand chess strategy play chess.
(D) Chess is more challenging than backgammon.
(E) All students who find backgammon challenging play checkers.
Which of the following must be true for the conclusion drawn above to be logically correct?
(A) All chess players understand chess strategy.
(B) Backgammon is more challenging than checkers.
(C) All students who understand chess strategy play chess.
(D) Chess is more challenging than backgammon.
(E) All students who find backgammon challenging play checkers.
OFFICIAL EXPLANATION
The correct response is (A). The argument's premises boil down to the following:
1. Wendy is a student who plays backgammon.
2. All students play either chess or checkers, but no backgammon player plays checkers.
Based on these premises we can conclude that Wendy plays chess. In order to also conclude that Wendy understands chess strategy, we must assume that all chess players understand chess strategy:
Premise: X is an A.
Assumption: All A's are B's.
Conclusion: X is a B.
Statement (A) provides the assumption needed to draw the conclusion.
General Discussion
14 Jun 2021, 09:47
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What is the source? This is not in the style of a GMAT question -- it's much more of an LSAT question, though the writing is a bit weird. Here Wendy plays backgammon, and backgammon players never play checkers, so Wendy does not play checkers. Everyone plays either checkers or chess, so Wendy plays chess. The conclusion says "Wendy understands chess strategy", which does not follow logically, but it does if "someone who plays chess understands chess strategy" is true.
So I'll guess the "OA" here is A, but it's not technically correct. The questions says "Which of the following must be true for the conclusion to be correct". None of the answer choices needs to be true for the conclusion to be correct. The conclusion would be correct if instead we knew as a premise "Wendy understands chess strategy", for example, or, non-trivially, if we knew "all backgammon players who play chess understand chess strategy". Answer A does not need to be true here. I think the question means to ask "the conclusion is properly drawn if which of the following is true?"
So I'll guess the "OA" here is A, but it's not technically correct. The questions says "Which of the following must be true for the conclusion to be correct". None of the answer choices needs to be true for the conclusion to be correct. The conclusion would be correct if instead we knew as a premise "Wendy understands chess strategy", for example, or, non-trivially, if we knew "all backgammon players who play chess understand chess strategy". Answer A does not need to be true here. I think the question means to ask "the conclusion is properly drawn if which of the following is true?"
