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n letters are written to n different persons and addresses on the n envelopes are also written. if the letters are placed in envelopes in random , the probability that at least one letter is not placed in the right envelope, is?

Answer» n letters are written to n different persons and addresses on the n envelopes are also written. if the letters are placed in envelopes in random , the probability that at least one letter is not placed in the right envelope, is?


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