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)xx.^(5)C_(4)`

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

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