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dishant007
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Sequence DS 09 Aug 2008, 19:08
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You know the drill.....your answers with explanations



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bhushangiri
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Sequence DS 09 Aug 2008, 19:23
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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..

what is the answer..
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IanStewart
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Sequence DS 10 Aug 2008, 04:50
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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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spriya
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Sequence DS 10 Aug 2008, 05:01
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dishant007
You know the drill.....your answers with explanations
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(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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