Question

Suppose that 10 cards, of which 7 are red and 3 are green, are placed at random into 10 envelopes, of which 7 are red and 3 are green. Determine the probability that exactly k envelopes will contain a card with a matching color for k= 0, 1, 2, ... , 10. (You can do this with each case individually or try to derive a formula written in terms of k.)

Answer 1

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