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[" he number of ways in which four diffe...

[" he number of ways in which four different letters can be put in their four addressed envelopes such "],[" at least two of them are in the wrong envelopes,are "23],[" 3) at least two of them are in the wrong envelopes,are "25],[" b) exactly two of them are in the wrong envelopes,are "6],[" D) exactly two of them are in the wrong envelopes,are "7]

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