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If the sum to infinty of the series , 1+...

If the sum to infinty of the series , `1+4x+7x^(2)+10x^(3)+….`, is `(35)/(16)`, where `|x| lt 1`, then `'x'` equals to

A

`2//5`

B

`1//5`

C

`3//5`

D

None of these

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The correct Answer is:
B
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