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A painting set has (5) brush sizes and (5) color palettes. In how many ways can one brush size and one palette be chosen?

Answer and explanation

Correct answer: 25

For each of the 5 brush sizes, any one of the 5 colour palettes can be selected. Therefore, by the fundamental principle of counting, the total number of selections is \(5 \times 5=25\). Adding the numbers gives 10, but addition is not used here because a brush size is paired with a palette. Exam tip: multiply the numbers of choices when independent selections are made together.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsClass 11 MathematicsProduct RuleCounting TechniquesMathematicsClass 11 Mcq

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