There are 6 letters and 6 addressed envelopes. Find the probability that at least one letter goes into the wrong envelope.

There are n letters and n addressed envelopes. Find the probability that all the letters are not kept in the right envelope.

There are n letters and n addressed envelopes. Find the probability that all the letters are not kept in the right envelope.

There are n letters and n addressed envelopes. Find the probability that all the letters are not kept in the right envelope.

There are n letters and n addressed envelopes. Find the probability that all the letters are not kept in the right envelope.

There are n letters and n addressed envelopes.Find the probability that all the letters are not kept in the right envelope.

There are 4 letters and 4 addressed envelopes. Find the probability that all the letters are not dispatched in right envelopes.

There are 4 letters and 4 addressed envelopes. Find the probability that all the letters are not dispatched in right envelopes.

There are 4 letters and 4 addressed envelopes. Find the probability that all the letters are not dispatched in right envelopes.

Ravi writes 5 letters and addresses 5 envelopes. If the letters are placed in the envelopes at random, then the probability that a least one letter goes into the wrong envelope is

Ravi writes 5 letters and addresses 5 envelopes. If the letters are placed in the envelopes at random, then the probability that a least one letter goes into the wrong envelope is