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a grab bag contains 11 $1 prizes, 7 $5 prizes and 2 $20 prizes. three prizes are chosen at random.

a grab bag contains 11 $1 prizes, 7 $5 prizes and 2 $20 prizes. three prizes are chosen at random. find the probability that a) exactly 2 $20 prizes are chosen
b)probability that one of each is chosen.
c) at least one $20 prize is chosen
D)no $1 prizes are chosen. Please help asap

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