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OpenStudy (anonymous):
2 bananas are to be selected from a group of 7. In how many ways can this be done?
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OpenStudy (anonymous):
1 5,040 21 42
OpenStudy (anonymous):
42 maybe
OpenStudy (anonymous):
how would you figure this out?
OpenStudy (anonymous):
while SELECTING use this rule, if there are 'n' choices for 'r' places, then there are nCr choices, and nCr = n!(n−r)!r! So, 9C3=9!(9−3)!3!
OpenStudy (anonymous):
ok thankyou
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OpenStudy (anonymous):
welcome
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