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A toy car is available in (4) colors and (3) wheel designs. How many total models are there?

Answer and explanation

Correct answer: 12

For each of the 4 colours, any one of the 3 wheel designs can be chosen. Therefore, by the fundamental principle of counting, the total number of models is \(4 \times 3 = 12\). Adding to get \(4+3=7\) is incorrect because colour and wheel design are independent choices, and every combination is possible. Exam tip: multiply the numbers of choices in independent successive steps.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsCounting PrincipleClass 11 MathematicsProduct RuleMathematicsClass 11 Mcq

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