If S _ n = n P + n ( n -1) 2 Q , where S n denotes the sum of the first n terms of an…
Mathematics · JEE Main · NTA Exams — Progression and Series
If \(\mathrm{S}_{\mathrm{n}}=\mathrm{n} \mathrm{P}+\frac{\mathrm{n}(\mathrm{n}-1)}{2} \mathrm{Q},\) where Sn denotes the sum of the first n terms of an A.P., then the common difference is
- P + Q
- 2P + 3Q
- 2Q
- Q
Answer
(D) Q
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