Teacher: In this task, you need to provide the correct option for a given problem on probability from the provided options.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Problem: in a throw of a coin find the probability of getting a tail ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 5 , e ) 2 / 7
Solution: a
Reason: "s = { h , t } e = { t } p ( e ) = 1 / 2 answer is a"

Now, solve this instance: Problem: 5 letters have to be put in 5 different envelopes numbered 1 through 5 such that each of the letters go into only 1 envelope . the letter is said to be put in correct position if for example letter 1 goes into envelope 1 . now what is the probability that all letters be put into wrong envelopes ? 
Options: a ) 1 / 3 , b ) 2 / 3 , c ) 11 / 120 , d ) 11 / 30 , e ) 76 / 120
Student:
d