dishant007 wrote:

You know the drill.....your answers with explanations

(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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