There are ten people in the Baking Club, including Mark. They choose 3 people to form an executive committee. How many possible committees could be formed that include Mark?
72 is wrong and 40 is wrong
There are 10*9 = 90 ways to choose the committee.
If you include Mark on the committee there are 9 people left to choose 2 from to form the committee
9 c 2 = 36
See - "https://web2.0calc.com/questions/halp_100"
