UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 115 of 120

Marks: +1, -0

If a variable takes values 0,1,2,3,…,n with frequencies

1,C(n,1),C(n,2),C(n,3),…,C(n,n)

respectively, then the arithmetic mean is

[NDA II 2017]

2n
n+1
n
n
2

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