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If S(n) = nP + (n (n - 1))/(2) Q where S...

If `S_(n) = nP + (n (n - 1))/(2)` Q where `S_n` denotes the sum of the first n terms of an A.P. , then the common difference is

A

`P + Q`

B

`2 P + 3 Q`

C

`2Q`

D

`Q`

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The correct Answer is:
D
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