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5 letters are placed at random in 5 addressed envelopes. Find the probability that (a) no letter is placed in its correct envelope. (b) exactly three letters are placed in correct envelopes. (c) atleast one letter is placed in correct envelope. (d) 2 specified letters are placed in wrong envelopes. (e) 2 specified letters are placed in correct envelopes. |
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Answer» (B) `(1)/(12)` (c) `(19)/(30)` (d) `(39)/(60)` (e) `(1)/(20)` |
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