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X follows a binomial distribution with p...

X follows a binomial distribution with parameters n and p where `0 lt p lt 1`.
If `(P(X=r))/(P(X=n-r))` is independent of n and r then p=

A

`1//2`

B

`1//3`

C

`1//4`

D

`1//5`

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The correct Answer is:
A
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