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Write the common difference of an A.P. t...

Write the common difference of an A.P. the sum of whose first`\ \ n` terms is `P/2n^2+Q n`

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`Sn​=n/2​[2a+(n−1)d] ....(i)`
`Sn​=P/2​n^2+Qn `
`Sn​=n/2​(2Q+Pn)`
`Sn​=n​/2(2Q+P(n−1)+P)`
`Sn​=n/2​(2(Q+P/2​)+P(n−1)) ....(ii)`
Comparing (i) and (ii) we get,
...
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