Answer
a) $\frac{5}{8}$
b) $\frac{7}{8}$
c) $\frac{0}{8} = 0$
Work Step by Step
a) There are a total of 8 balls, and 5 of them are red, so the probability is $\frac{5}{8}$.
b) There are 8 balls, and 7 are not yellow, so the probability is $\frac{7}{8}$.
c) There are no black balls, so the probability is 0.
