Suppose a random variable X follows the ...

Suppose a random variable X follows the binomial distribution with parameters n and p, where `0ltplt1` If `P(X=r)/(P(X=n-r))` is independent of n and r, then p equals

A

`1/2`

B

`1/3`

C

`1/5`

D

`1/7`

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The correct Answer is:

A

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