A salad bowl of 4 ingredients is chosen from 3 types of lettuce and 4 types of tomatos. The salad must have at least 1 type of lettuce and at least 2 types of tomatos. How many ways can this salad be made?  Pick one.
A) 106	B) 30	C) 16	D) 18	E) 12
Solution: We have two possibilities 1L 3T or 2L 2T   (3C1)(4C3)+(3C2)(4C2)=30   30) 30
<result>B</result>
A salad bowl of 4 ingredients is chosen from 3 types of lettuce and 4 types of tomatos. The salad must have at least 1 type of lettuce and at least 2 types of tomatos. How many ways can this salad be made?