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# Sequence DS

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Manager
Joined: 27 Mar 2008
Posts: 63

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09 Aug 2008, 19:08
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Manager
Joined: 15 Jul 2008
Posts: 205

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09 Aug 2008, 19:23
I can never be confident with these buggers..

i think C ...

Here for finding n, you need either (first term and the constant diff/ratio) or (sum of all numbers and the mean)

1 and 2 combined give u the latter. so i think c..

GMAT Tutor
Joined: 24 Jun 2008
Posts: 1345

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10 Aug 2008, 04:50
Neither statement is sufficient on its own- n could be anything.

Together: average = sum/n, so n = sum/average = 3124/4. Sufficient- C.
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VP
Joined: 17 Jun 2008
Posts: 1279

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10 Aug 2008, 05:01
dishant007 wrote:

(1) is insufficient just gives sum no clue about how series . n cannot be found.
(2)is insufficient . gives A.mean of series .
mean=m=s/n where s is sum m=4 and n =? s=not known
hence Insuffi

(1) and (2) sufficient since we know sum of n terms mean hence n can be obtained

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Re: Sequence DS &nbs [#permalink] 10 Aug 2008, 05:01
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