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If the sum to infinity of the series 1 +...

If the sum to infinity of the series 1 + 2r +`3r^(2) + 4r^(3)+ cdots ` is 9/4 then value of of r is

A

A) `1//2`

B

B) `1//3`

C

C) `1//4`

D

D) None of these

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