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If `S_(n)` is the sum of a G.P. to n terms of which r is the common ratio, then : `(r-1)*(d)/(dr)(S_(n))+nS_(n-1)=`

A

`nS_(n-1)`

B

`(n-1)S_(n)`

C

`n(S)_(n)`

D

`n*S_(n+1)`

Text Solution

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The correct Answer is:
B
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