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I have no idea how to do this problem. I tried using a venn diagram, but that didn't seem to work..

And for this problem:

In a card game, a hand of 5 cards contains at least 2 spades. What is the probability that there are exactly 4 spades in that hand?

I tried doing

_{5}C

_{4}(13/52)^4(39/52), but it wasn't correct..