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Numbers (Data sufficiency question)

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Numbers (Data sufficiency question) [#permalink]

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New post 05 Feb 2018, 02:55
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If S is a sequence of consecutive multiples of 3, how many multiples of 9 are there in S?

(1) There are 15 terms in S.

(2) The greatest term of S is 126.

I had opted for option C (BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked). However the correct answer is A (statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked).

Reason I chose C - It's nowhere mentioned that the 15 terms in the set are the first 15 consecutive multiples. With 1 & 2 combined the number of multiples of 9 can be determined. Could someone please explain why the correct answer will be A?
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Re: Numbers (Data sufficiency question) [#permalink]

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New post 05 Feb 2018, 02:59
Hobbit20 wrote:
If S is a sequence of consecutive multiples of 3, how many multiples of 9 are there in S?

(1) There are 15 terms in S.

(2) The greatest term of S is 126.

I had opted for option C (BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked). However the correct answer is A (statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked).

Reason I chose C - It's nowhere mentioned that the 15 terms in the set are the first 15 consecutive multiples. With 1 & 2 combined the number of multiples of 9 can be determined. Could someone please explain why the correct answer will be A?


Discussed here: https://gmatclub.com/forum/if-s-is-a-se ... 72766.html Hope it helps.

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Re: Numbers (Data sufficiency question)   [#permalink] 05 Feb 2018, 02:59
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