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OpenStudy (anonymous):
I dont know the formula to solve these problems.
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OpenStudy (anonymous):
OpenStudy (mrnood):
“n choose r” = C(n,r) = n! / ( r! (n - r)! ) in your first case n=10, r =3 calculate 10!, 3!,7! Put them in th e formula the second is the same
OpenStudy (anonymous):
ok thanks.
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