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Q.

If a variable takes the values 0, 1, 2, ....., n with frequencies proportional to binomial coefficients nC0, nC1, nC2, ....., nCn ; then mean of distribution is

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a

2nn+1

b

2n+1n(n+1)

c

n+12

d

n2

answer is D.

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Detailed Solution

∑ fixi∑fi =n 2n-12n=n2

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