Question

9 students volunteer for a committee. How many different 2-person committees can be chosen?

72

36

362,880

1

Answer 1

it is definitely going to be 72

Answer 2

The answer is 72, since for the first person, we have 9 choices.  The second choice, we have 8 choices.  Therefore, the answer is 8 times 9, which is 72.