UPSC NDA Math Model Paper 4

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Question : 110 of 120

Marks: +1, -0

Find the sum of the series whose nth term is (2n−1)2?

n.(n−1).(2n−5)
6
n.(n−1).(2n−7)
6
n.(n+1).(2n+7)
6
n.(2n+1).(2n−1)
3

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