The probability that a student is not a swimmer is $\frac{1}{5}$ . Then the probability that out of five students, four are swimmers is (A) ${}^5{C}_4{\left(\frac{4}{5}\right)}^4\frac{1}{5}$ (B) ${\left(\frac{4}{5}\right)}^4\frac{1}{5}$ (C) ${}^5{C}_1\frac{1}{5}{\left(\frac{4}{5}\right)}^4$ (D) None of these

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