Question

A, B, C try to hit a target simultaneously but independently. Their respective probabilities of hitting the targets are $\frac{3}{4},\ \frac{1}{2}\ and\ \frac{5}{8}$. The probability that the target is hit by A or B but not by C is:
(a) $\frac{21}{64}$
(b) $\frac{7}{8}$
(c) $\frac{7}{32}$
(d) $\frac{9}{64}$

Answer 1

your answer is option number (a)