For this case we have the following functions:

We must find
. By definition of compound functions we have to:

So:
Taking into account that:

Different signs are subtracted and the major sign is placed.

Finally we have to:

Answer:

2 more females than males
All in all there are 26 pieces of clothing available. The probability of randomly selecting a blue piece is equal to 18/26. Also, the probability of picking up a pants is 14/26. There are 10 blue pants and the probability of picking up one of those is 10/26. The answer can be computed as follows:
P(A or B) = (18/26) + (14/26) - (10/26) = 22/26
P(A or B) = 22/26 or 11/13