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Let X be a set containing n elements. If...

Let X be a set containing n elements. If two subsets A and B of X are picked at random, the probability that A and B have the same number of elements is

A

`(.^2nC_n)/(2^n)`

B

`(1)/(.^2nC_n)`

C

`(1cdot3cdot5…(2n-1))/(2^ncdotn!)`

D

`(3^n)/(4^n)`

Text Solution

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The correct Answer is:
(a,c)
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