UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 4 of 120

Marks: +1, -0

If Sn=nP+‌‌

n(n−1)Q

2

,where Sn denotes the sum of the first n terms of an AP, then the common difference is

[NDA II 2017]

P + Q
2P + 3Q
2Q
Q

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