How many different combinations of winning tickets

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Reference no: EM13147356

A raffle is being held at a school to raise money for the library. The organizers sell 20 tickets. They will select 3 winning tickets at random for prizes.

a) How many different combinations of 3 winning tickets can there be?

b) Suppose you hold 4 tickets. What is the probability that you will win exactly 2 out of the 3 prizes.

Reference no: EM13147356

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