1.

The sum to n terms of the series 1 + (1 + 3) + (1 + 3 + 9) + (1 + 3 + 9 + 27)+ .......... is

Answer»

`(3(3^(n) - 1))/4 - 1`
`(3(3^(n) - 1) - 2n)/4`
`(3(3^(n) - 1) - n)/4`
`(2n - 3(3^(n) - n))/4`

ANSWER :B


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