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Question
There are n letters and n addressed envelopes. The probability that all the letters are not kept in the right envelope, is
There are n letters and n addressed envelopes. The probability that all the letters are not kept in the right envelope, is
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Solution
The correct option is B
Required probability is 
(All letters in right envelope) 
{As there are total number of 
ways in which letters can take envelopes
and just one way in which they have corresponding envelopes}.
Required probability is (All letters in right envelope)
{As there are total number of ways in which letters can take envelopes
and just one way in which they have corresponding envelopes}.