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n different letters are placed in n diff...

n different letters are placed in n different addressed envelopes at random. Find the probability that (i) no letter is placed in right envelope i.e., all the letters are placed in wrong envelopes. (ii) atleast one letter is placed in right envelope.

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The correct Answer is:
`1 - {(1)/(|ul(2)) - (1)/(|ul(3)) + (1)/(|ul(4))...+(-1)^(n) (1)/(|ul(n))}`
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