Question: A secretary types five letters and the five corresponding envelopes. In a hurry, they place at random one letter in each envelope. what is the

A secretary types five letters and the five corresponding envelopes. In a hurry, they place at random one letter in each envelope. what is the probability that: (a) at least one letter is in the correct envelope? (b) no letter is in the correct envelope? (c) exactly three letters are in the correct envelop

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