Q. 53.7( 3 Votes )

If , then Sn is equal to
A. 2n – n - 1

B.

C.

D. 2n– 1

Answer :

1 + 2 + 22 + …….2r - 1=1(2r - 1)/2 - 1


1 + 2 + 22 + …….2r - 1=1(2r - 1)






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