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A room decoration has (5) wall colors (2) curtain options and (4) lamp options. How many decorations can be made?

Answer and explanation

Correct answer: 40

For each decoration, choose one of 5 wall colours, one of 2 curtain options, and one of 4 lamp options. Since these choices are independent, the multiplication principle gives \(5 \times 2 \times 4=40\) decorations. Adding them to get \(5+2+4=11\) is incorrect because choices are being made at successive stages. Exam tip: multiply the numbers of choices when independent selections occur in separate steps.

Related tags

Fundamental Principle Of CountingMultiplication PrinciplePermutations And CombinationsClass 11 MathematicsCounting TechniquesMathematicsClass 11 Mcq

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