The three competitors in a race have to be randomly chosen from a group of four men and five women. How many different such trios contain at least one woman?	Select
A) 50 B) 60 C) 70 D) 80 E) 90
The total number of ways to choose three runners 9C3 = 84   The number of trios with only males is 4C3 = 4   The number of trios which include at least one woman is 80.   The answer is 80.
<result>D</result>
The three competitors in a race have to be randomly chosen from a group of four men and five women. How many different such trios contain at least one woman?