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The probability that a student is not a ...

The probability that a student is not a swimmer is 1/5. Then find the probability that out of 5 students exactly 4 are swimmer.

A

`(4/5)^4`

B

`(.^5 C_4) (4/5)^4`

C

`(4/5)^4 (1/5)`

D

none of these

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A
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