Suppose 50 socks lie in a drawer. Each one is either white or black, ankle-high or knee-high, and either has a hole or doesn't 22 socks are white, four of these have a hole, and one of these four is knee-high. The white socks are knee-high, ten black socks are knee-high, and five knee-high socks have a hole. Exactly three ankle-high socks have a hole.

A. Use Theorem 2.6 to determine the number of black, ankle-high socks with no holes.
B. Draw a Venn diagram that shows the number of socks with each combination of characteristics.