Abox contains 4 black shirts, 8 blue shirts, 4 black pants, and 10 blue pants. determine the probability of randomly selecting a blue piece of clothing or a pair of pants. use the formula
p(aorb)  p(a)p(b)p(aandb)

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