SOLUTION: A class has 10 boys and 12 girls. Find the probabliltity of selecting a committee of four with at most two girls? I have the answer, which is 4620/ 7315. I got 7315 by doing 22C4.
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Question 615815: A class has 10 boys and 12 girls. Find the probabliltity of selecting a committee of four with at most two girls? I have the answer, which is 4620/ 7315. I got 7315 by doing 22C4. How do i get 4620?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
"at most two" means none, one, or two
none means all boys ___ 10C4
one ___ 12C1 * 10C3
two ___ 12C2 * 10C2
add the three cases to get 4620
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