Bob has 7 oranges, 10 plums and 4 pears in a bowl. He can choose: an orange and a plum or a plum and a pear or an orange, a plum and a pear. How many different ways can Bob choose a fruit from the bowl?

In statistics the word "and" symbolized for multiplaction operation and the word "or" symbolized addition operation. so the number of ways can bob choose a fruit from the bowl is:

P = (7 x 10) + (10 x 4) + (4 x 7)

P = 138 ways he can choose a fruit from the bowl