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A library has 8 mathematics books and 6 science books. In how many ways can one book be chosen?

Answer and explanation

Correct answer: 14

The governing concept is the addition principle of counting. The selected book must be either one of the 8 mathematics books or one of the 6 science books. These are mutually exclusive categories for a single choice, so their counts are added: 8 + 6 = 14. Therefore option B is correct. Multiplying 8 by 6 would count pairs consisting of one mathematics book and one science book, but the question asks for only one book. Choosing 8 or 6 alone ignores the other category and gives an incomplete total. Because no book is counted in both categories, there is no overlap to subtract. The wording “one book” and the alternative “mathematics or science” signal that addition, not multiplication, is required.

Related tags

Permutations And CombinationsFundamental Counting PrincipleAddition RuleMutually Exclusive ChoicesFundamental Principle Of CountingMathematicsClass 11 Mcq

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