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The number of ways in which four differe...

The number of ways in which four different letters can be put in their four addressed envelopes that

A

at least two of them are in the wrong envelopes, are 23

B

at least two of them are in the wrong envelopes, are 25

C

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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