If S = [1+(-1/3)][1+(-1/3)2][1+(-1/3)4][1+(-1/3)8....till n terms. The

1.	If S = [1+(-1/3)][1+(-1/3)2][1+(-1/3)4][1+(-1/3)8....till n terms. Then S = ? (a) 4(102n − 1) (b) 4/3(10n − 1) (c) 2/3(10n − 1) (d) None of these
Answer» Correct option (d) None of these Explanation: For n = 1 sum = 2/3 For n = 2 sum = 20/27 For n = 3 sum = 1640/2187 None of the options matches these numbers and hence option (d) is correct.

If S = [1+(-1/3)][1+(-1/3)2][1+(-1/3)4][1+(-1/3)8....till n terms. Then S = ? (a) 4(102n − 1) (b) 4/3(10n − 1) (c) 2/3(10n − 1) (d) None of these

Answer»

Correct option (d) None of these

Explanation:

For n = 1 sum = 2/3

For n = 2 sum = 20/27

For n = 3 sum = 1640/2187

None of the options matches these numbers and hence option (d) is correct.

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If S = [1+(-1/3)][1+(-1/3)2][1+(-1/3)4][1+(-1/3)8....till n terms. Then S = ? (a) 4(102n − 1) (b) 4/3(10n − 1) (c) 2/3(10n − 1) (d) None of these

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