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A wheel has (4) colors and (3) shapes available. In how many ways can a design be made by choosing one color and one shape?

Answer and explanation

Correct answer: 12

For each of the 4 colors, any one of the 3 shapes can be chosen. Therefore, by the fundamental principle of counting, the total number of designs is \(4\times 3=12\). Option 7 results from adding the numbers of colors and shapes, but a design requires one choice of each, so the numbers must be multiplied. Exam tip: For successive independent choices, multiply the number of available choices at each step.

Related tags

Fundamental Counting PrincipleMultiplication RulePermutations And CombinationsClass 11 MathematicsCounting TechniquesFundamental Principle Of CountingMathematicsClass 11 Mcq

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