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

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

`P+Q`

`2P+3Q`

`2Q`

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