SOLUTION: A group of three seniors, six juniors, and five sophomores must select a committee of three. How many committees are possible if the committee must contain the following: a. One

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Question 322422: A group of three seniors, six juniors, and five sophomores must select a committee of three. How many committees are possible if the committee must contain the following:
a. One person from each class.
b. Any mixture of the classes.
c. Exactly two seniors.

Found 2 solutions by stanbon, Edwin McCravy:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A group of three seniors, six juniors, and five sophomores must select a committee of three. How many committees are possible if the committee must contain the following:
a. One person from each class.
# of ways = 3*6*5 = 90
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b. Any mixture of the classes.
14C3 = 364
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c. Exactly two seniors.
3C2*11 = 3*11 = 33
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Cheers,
Stan H.

Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
A group of three seniors, six juniors, and five sophomores must select a committee of three. How many committees are possible if the committee must contain the following:
a. One person from each class.

Choose the senior 3 ways, then choose the junior 6 ways, 
then choose the sophomore 5 ways.  3x6x5 = 90 possible 
committees.

b. Any mixture of the classes.

14 students, choose 3 = 14C3 = %2814%2A13%2A12%29%2F%283%2A2%2A1%29%22=%22%2814%2A13%2Across%2812%29%5E2%29%2F%28cross%283%2A2%29%2A1%29%22=%2214%2A13%2A2%22=%22364

c. Exactly two seniors.

(3 seniors, choose 2) AND (11 non-seniors choose 1) = (3C2)(11C1) = %283%2A2%29%2F%282%2A1%29%22%22%2A%22%2211%2F1= 3*11 = 33 ways.

Edwin