UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 28 of 120

Marks: +1, -0

If

1.3+2.32+3.33+...+n.3n=

(2n−1)3a+b

4

then a and b are respectively

[NDA II 2017]

n,2
n,3
n+1,2
n+1,3

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