Statistics

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A raffle is being conducted with 50 tickets to be sold - one per customer.
There are three prizes to be awarded.
If the four organizers of the raffle each buy one ticket, what is the probability that the four organizers win:

a) all of the prizes?
b) exactly two of the prizes
c) exactly one of the prizes
d) none of the prizes

This is at the end of a chapter on counting combinations/permutations

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