SOLUTION: A committee of Seven Congressmen will be selected from a group of nine Republicans and four democrats . Find the number of ways of obtaining a committee with exactly three Republic

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Question 1167341: A committee of Seven Congressmen will be selected from a group of nine Republicans and four democrats . Find the number of ways of obtaining a committee with exactly three Republicans.
Answer by Boreal(15235) About Me  (Show Source):
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13C7 number of total ways
for the R it is 9C3*4C4
This is = 84 ways