1.

The sum of series 1 + 2x + 3x^(2) + 4x^(3) + ...... up to infinity when x lies between 0 and 1 i.e., 0 lt x lt 1 is

Answer»

`(1-x)^(-2)`
`(1+x)^(-2)`
`(1-x)^(2)`
`(1+x)^(2)`

ANSWER :B


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