Three letters are written to different persons and addressess to three envelopes are also written. Without looking at the addresses, the probability that probability that the letters go into right envelopes, is

Three letters are written to different persons , and the addresses on the three envelopes are also written . Without looking at the addresses , find the probability that the letters go into the right envelopes .

(b)Three letters are written to different persons and addresses on the envelope are written.without looking at the addresses,the letters are put into the envelopes,the probability that letters go into right envelopes.

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!)

Three letters are sent to different persons and addresses on the three envelopes are written at random . The probability that the letters go into the right envelops is :

Three letters are written to different persons and their addresses are also written on three envelopes. Letters are put at random in the envelopes. Then the probability that at least two letters are put in correct envelopes, is _______.

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