Four different letters are written and the corresponding addresses are correctly written on four envelopes . One letter can be replaced in one envelope . Find the numbers of ways so that all the letters are wrongly placed.

There are 5 letters and 5 directed envelopes. The number of ways in which all the letters can be put in wrong envelope is

There are 4 envelops and 4 letters are to be put in these envelopes randomly, then number of ways such that at least 2 letters are placed in wrong envelope.

There are four letters and four envelopes, the letters are placed into the envelopes at random, find the probability that all letters are placed in the wrong envelopes.

A secretary writes 4 letters and the corresponding address on 4 envelopes if he inserts the letters in the envelopes at random irrespective of address then calculate the probability that all the letters are wrongly placed.

A person writes letters to six friends and addresses the corresponding envelopes. Let x be the number of ways so that atleast two of the letters are in wrong envelopes and y be the number of ways so that all the letters are in wrong envelopes. Then, x-y is equal to

A person writes letters to six friends and addresses the corresponding envelopes. Let x be the number of ways so that atleast two of the letters are in wrong envelopes and y be the number of ways so that all the letters are in wrong envelopes. Then, x-y is equal to

A person writes letters to six friends and addresses the corresponding envelopes. Let x be the number of ways so that atleast two of the letters are in wrong envelopes and y be the number of ways so that all the letters are in wrong envelopes. Then, x-y is equal to

A person writes letters to six friends and addresses the corresponding envelopes. Let x be the number of ways so that atleast two of the letters are in wrong envelopes and y be the number of ways so that all the letters are in wrong envelopes. Then, x-y is equal to