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N people put their phones in a bowl, and each one takes a phone at random. What is the probability that nobody takes their own
N people put their phones in a bowl, and each one takes a phone at random.
What is the probability that nobody takes their own phone in the following case?
(You do not need to compute the probabilities numerically in this problem, but the derivation of your nal expression should be clear.)
a. N = 10
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