. The probability that two specified letters will be placed in the correct envelopes is 1[n(n – 1)]. The probability that none of the othern – 2 letters will then be placed in the correct envelopes is qn-2. Therefore, the probability that only the two specified letters, and no other letters, will be placed 1 in the correct envelopes is It follows that the probability that exactly two of the n n(n – 1) letters will be placed in the correct envelopes, without specifying which pair will be correctly placed,

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