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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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From (5) mathematics, (4) physics, and (3) chemistry books, (6) books are to be selected. The selection must contain books from exactly (2) subjects. How many selections are possible?

Answer and explanation

Correct answer: (119)

Choose (6) books from each pair of subjects and add the three results. Here, selecting all (6) from one subject is impossible.

Related tags

BooksExactly-Two-SubjectsCombinationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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