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A library card has (2) membership types (4) validity periods and (3) card colors. How many card options are possible?

Answer and explanation

Correct answer: 24

A card is formed by independently choosing a membership type, a validity period, and a colour. By the fundamental principle of counting, the total number of options is \(2 \times 4 \times 3=24\). Option 18 may result from incorrectly adding choices; independent stages are multiplied. Exam tip: Multiply the numbers of choices when every choice at one stage can be paired with every choice at the next stage.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsClass 11 MathematicsCounting PrincipleMultiplication RuleMathematicsClass 11 Mcq

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