SOLUTION: Find the number of ways in which 9 people can be divided into 2 groups: the first group has 5 people and the second group has 4 people.

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Question 1115416: Find the number of ways in which 9 people can be divided into 2 groups: the first group has 5 people and the second group has 4 people.
Answer by stanbon(75887) About Me  (Show Source):
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Find the number of ways in which 9 people can be divided into 2 groups: the first group has 5 people and the second group has 4 people.
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# of 4 people groups = # of 5 people groups if the total # of people is 9
9C4 = (9*8*7*6)/(1*2*3*4) = (3*1*7*6) = 21*6 = 126
Cheers,
Stan H.
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