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14 Jun 2021, 07:48
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
45% (01:36) correct
55%
(00:51)
wrong
based on 116
sessions
History
Date
Time
Result
Not Attempted Yet
Which of the following is NOT a divisor of \(x\)?
(A) \(7\)
(B) \(15\)
(C) \(39\)
(D) \(55\)
(E) \(91\)
(A) \(7\)
(B) \(15\)
(C) \(39\)
(D) \(55\)
(E) \(91\)
14 Jun 2021, 07:56
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We can leverage the fact that a PS question has exactly 1 correct answer.
First, find the prime factorizations of the answer choices:
(A) \(7\)
(B) \(3*5\)
(C) \(3*13\)
(D) \(5*11\)
(E) \(7*13\)
Could A be the correct answer? If so, \(x\) would NOT be divisible by \(7\). In that case, \(x\) would NOT be divisible by \(91\) either! We would have 2 correct answers, which is not possible. Since A is not the correct answer, \(x\) must in fact be divisible by \(7\).
Could E be the correct answer? Since we know that \(x\) is divisible by \(7\), that would require \(x\) to NOT be divisible by \(13\). In that case, we would have 2 correct answers, E and C. Since this is not possible, \(x\) must be divisible by \(13\).
Continuing this reasoning, the only prime factor appearing in the answer choices that does not produce a contradiction is \(11\).
Answer D.
First, find the prime factorizations of the answer choices:
(A) \(7\)
(B) \(3*5\)
(C) \(3*13\)
(D) \(5*11\)
(E) \(7*13\)
Could A be the correct answer? If so, \(x\) would NOT be divisible by \(7\). In that case, \(x\) would NOT be divisible by \(91\) either! We would have 2 correct answers, which is not possible. Since A is not the correct answer, \(x\) must in fact be divisible by \(7\).
Could E be the correct answer? Since we know that \(x\) is divisible by \(7\), that would require \(x\) to NOT be divisible by \(13\). In that case, we would have 2 correct answers, E and C. Since this is not possible, \(x\) must be divisible by \(13\).
Continuing this reasoning, the only prime factor appearing in the answer choices that does not produce a contradiction is \(11\).
Answer D.
16 Jun 2021, 18:48
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Do we see this kind of questions in GMAT?
This looks more like a CAT question.
P.s: CAT is an entrance exam for Indian B-schools
This looks more like a CAT question.
P.s: CAT is an entrance exam for Indian B-schools
