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: in how many ways can 22 books on english and 20 books on hindi be placed in a row on a shelf so that two books on hindi may not be together ? 
Options: a ) 4586 , b ) 5896 , c ) 2415 , d ) 1771 , e ) 1881
Student:
d