Hi,

In how many ways can 12 athletes be awarded a first-place medal, a second place medal, 

and a third-place medal?  nPx = 12P3 = = 12!/9! = 1320



In how many different ways can a student choose 3 out of 8 problems to complete

 on a take-home exam?  nCx = 8C3 =  = 8!/3!5! = 56



If event A is certain to occur... P(A) = 1

 

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