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From (5) Hindi and (6) Sanskrit books, in how many ways can (2) Hindi and (3) Sanskrit books be selected?

Answer and explanation

Correct answer: (200)

The two kinds of books must be selected separately because the requirement is exactly two Hindi books and exactly three Sanskrit books. For the Hindi books, choose 2 from 5, giving \\(\\binom{5}{2}=10\\) possibilities. For the Sanskrit books, choose 3 from 6, giving \\(\\binom{6}{3}=20\\) possibilities. The order in which books are selected does not matter, so combinations are appropriate rather than permutations.

A Hindi selection can be paired with any Sanskrit selection, so the multiplication principle gives \\(\\binom{5}{2}\\binom{6}{3}=10\times20=200\\). Therefore option D is correct. Adding the two counts would be inappropriate because every valid result includes both a Hindi group and a Sanskrit group. The product counts all possible pairs of the two independent selections exactly once.

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CombinationsClass11Easy

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