The probability that a student is not a ...

The probability that a student is not a swimmer is `1/5`. Then the probability that out of five students, four are swimmers is

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

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

`""^(5)C_(2)(1)/(5)((4)/(5))^(4)`

None of these

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