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From (6) mathematics books and (5) physics books, a group of (4) books is to be selected with at least one book from each subject. How many groups are possible?

Answer and explanation

Correct answer: (325)

Subtract all-math and all-physics selections from (\binom{11}{4}). The complement method is faster for such restrictions.

Related tags

CombinationsComplementCountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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