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For a school badge (5) shapes and (4) colors are available. In how many ways can one shape and one color be chosen?

Answer and explanation

Correct answer: 20

Making one badge involves two independent choices: 1 of 5 shapes and 1 of 4 colors. Each shape can be paired with any of the 4 colors, so by the fundamental principle of counting, the total number of choices is \(5 \times 4 = 20\). Adding to get 9 is incorrect because independent successive choices are multiplied. Exam tip: For independent steps joined by “and”, usually multiply the numbers of choices.

Related tags

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

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