The probability that a student is not a swimmer is 1/5. Then, the pro…

${ }^5 C_4\left(\frac{1}{5}\right)\left(\frac{4}{5}\right)^4$

${ }^5 C_4\left(\frac{1}{5}\right)^4\left(\frac{4}{5}\right)$

${ }^5 C_3\left(\frac{1}{5}\right)^2\left(\frac{4}{5}\right)^3$

$\left(\frac{4}{5}\right)^4\left(\frac{1}{5}\right)$