Question

The probability that a randomly selected student is a sophomore or male.

Upper level algebra
The probability that a randomly selected student is a sophomore or male.

$$=\frac{n(sophomore)+n(male)-n(sophomore and male)}{n(S)}$$
$$=\frac{15+18-8}{33}$$
$$=\frac{25}{33}$$
Thus, the probability that a randomly selected student is a sophomore or male is $$\frac{25}{33}$$.