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If S(n) denotes the sum of n terms of an...

If `S_(n)` denotes the sum of n terms of an AP whose common difference is d, the value of `S_(n)-2S_(n-1)+S_(n-2)` is

A

d

B

2d

C

4d

D

`d^(2)`

Text Solution

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The correct Answer is:
A
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