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From (3) mathematics books and (4) science books, in how many ways can (1) mathematics book and (1) science book be chosen?

Answer and explanation

Correct answer: 12

There are 3 ways to choose 1 mathematics book and 4 ways to choose 1 science book. Since these are independent selections, apply the multiplication principle: \(3 \times 4=12\). The value 24 would result from incorrectly adding or multiplying extra selections. Exam tip: for fixed selections from separate groups, multiply the relevant combinations: \(\binom{3}{1}\binom{4}{1}=12\).

Related tags

CombinationsMultiplication PrinciplePermutations And CombinationsClass 11 MathematicsBook SelectionMathematicsClass 11 Mcq

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