SOLUTION: a teacher has 7 boys and 20 girls in her class. In how many ways can she select 4 of the children to be in a play if she must select 2 boys and 2 girls
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Question 802245: a teacher has 7 boys and 20 girls in her class. In how many ways can she select 4 of the children to be in a play if she must select 2 boys and 2 girls Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a teacher has 7 boys and 20 girls in her class. In how many ways can she select 4 of the children to be in a play if she must select 2 boys and 2 girls
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# of ways to select 2 boys: 7C2 = 21
# of ways to select 2 girls: 20C2 = (20*19)/(1*2) = 190
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# of ways to select 2 boys and 2 girls: 21*190 = 3990
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Cheers,
Stan H.
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