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

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

A

P + Q

B

`2P+3Q`

C

`2Q`

D

Q

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The correct Answer is:

D

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