Math help? In how many ways can a...

1) in how many ways can a committee of 3 people be chosen from a group of 10 people?

2) in how many ways can a president, vice president, and treasurer be chosen from a group of 10 people?

1) in how many ways can a committee of 3 people be chosen from a group of 10 people?
combinations = 10*9*8/(1*2*3) = 120 ways

2) in how many ways can a president, vice president, and treasurer be chosen from a group of 10 people?
permutations = 10*9*8 = 720 ways