Answer
See below.
Work Step by Step
a) In this case the events are independent: $\frac{3}{16}\frac{5}{16}=\frac{15}{256}$
b) In this case the events are not independent: the first one has probability $\frac{3}{16}$, and the second one has probability $\frac{5}{15}$; thus the probability is: $\frac{3}{16}\frac{5}{15}=\frac{1}{16}$
