The probability that a student is not a ...

The probability that a student is not a swimmer is `1/5`. What is the probability that out of 5 students, 4 are swimmers?

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

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

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

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