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

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!)

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 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

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

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

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

There are 10 envelopes and 10 letters to go inside them. Each letter is meant for a specified envelope only. What is the probability that exactly 9 of them are in the right envelopes ?

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.