L&T Company Numerical Ability Permutation and Combination

In how many ways can 21 books on English and 19 books on Hindi be place in a row on a shelf so that two books on Hindi may not be together?
1] 3990 2] 1540 3] 1995 4] 3672

Read Solution (Total 1)

Place are xExExEx..
E denote English and x denote Hindi
Since there are 21 books on English, the no of places marked X are 22.
Now, 19 places out of 22 can be chosen in
22c19=22c3=1540
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