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Consider an A.P. with first term a and c...

Consider an A.P. with first term a and common difference d. Let `S_k` denote the sum of the first k terms. If `S_(kx)/S_(x)` is independent of x, then

A

`a=d//2`

B

`a=d`

C

`a=2d`

D

None of these

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A
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