SOLUTION: How many committees can be formed from a group of 9 doctors if each committee consists of 7 doctors. PLease help!!!!! This is a question that I must explain step by step how to do

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Question 354249: How many committees can be formed from a group of 9 doctors if each committee consists of 7 doctors. PLease help!!!!!
This is a question that I must explain step by step how to do, I have 25 of them, and I got all of them but this one. Please, I sincerely appreciate any help.

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
*Note: The number of combinations of a set of n objects taken r at a time is given by nCr = (n!)/(r!(n - r)!).
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How many committees can be formed from a group of 9 doctors if each committee consists of 7 doctors
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9 choose 7
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Leaving:
9C7+=%289%2A8%29%2F2 = 36 ways