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

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 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.

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

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!)

If four letters are placed into 4 addressed envelopes at random,the probability that exactly two letters will go wrong is

3 Letters are placed in 3 envelopes randomly. The probability that only one letter goes in right envelope is A 1/2 B 1/3 C 1/6 D 2/3

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 _______.

Three letters, to each of which corresponds an envelope, are placed in the envelopes at random. The probability that all the letters are not placed in the right envelopes, is