random set 22 prizes (11 $1; 7 $5; 4 $20) - how to find the # of ways to pull 2 $20 in 3 trys?

1540 ways to choose 3 prizes; now, how many ways can exactly 2 of the 3 prizes be a $20 prize (4 total available).
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by Level 10 User (57.4k points)

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