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If a variable takes values 0,1,2....with...

If a variable takes values 0,1,2....with frequencies proportional to the binomial coefficients `""^aC_n, ""^aC_1 ..""^aC_n` respectively then mean of the distribution is

A

`n//2`

B

`(n(n + 1))/(2)`

C

`(n(n - 1))/(2)`

D

`(n + 1)/2`

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