Question

There Are 4 Addressed Covers And 4 Letters.If 4 Letters Are Put In 4 Covers Randomly Then The Probability That Not More Than One Letter Is Put In Proper Cover Is​

Answer 1

Answer:

Given that a person writes four letter and address four envelopes then,

Number of ways in which four letter can be placed in four envelopes is 4!=24 ways

Now, if all the letters go into the right envelopes then that can be done only in 1 way.

∴   The probability that the letters go into the right envelop=241​

∴   the probability that one go into the right envelops is 1−241​=2423​

Hence the required probability is 2423​.