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 person write 4 letters and addresses 4 envelopes. If the letters are placed in the envelopes at random, then the probability that all letters are not placed in the right envelopes, is a. 1/4 b. 11/24 c. 15/24 d. 23/24

There are 3 letters and 3 envelopes. Find the number of ways in which all letters are put in the wrong 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

n letters are written to n different persons and addresses on the n envelopes are also written. If the letters are placed in the envelopes at random,the probability that at least one letter is not placed in the right envelope,is (A) 1-(1)/(n) (B) 1-(1)/(2n) (C) 1-(1)/(n^(2))(D)1-(1)/(n!)

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 envelopes corresponding to 4 letters. If the letters are placed in the envelopes at random, probability that all the letters are not placed in the right envelopes is

n letters are written to different persons and their addresses are also written on n envelopes. Letters are put at random in the envelopes. Then the probability that at least one letter is put in wrong envelope, is _______.