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A book set has (6) subjects (2) cover types and (5) sizes. How many ways are there to choose one subject one cover and one size?

Answer and explanation

Correct answer: 60

To form one book choice, three independent selections are made: one of 6 subjects, one of 2 cover types, and one of 5 sizes. By the fundamental principle of counting, the total number of choices is \(6 \times 2 \times 5=60\). The value 30 comes from \(6 \times 5\) and incorrectly ignores the 2 cover-type choices. Exam tip: Multiply the number of choices when every choice at one stage can be combined with every choice at the next stage.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsClass 11 MathematicsProduct RuleCounting PrincipleMathematicsClass 11 Mcq

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