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A student chooses one from (6) pen colors and one from (3) highlighter colors. How many total pairs are formed?

Answer and explanation

Correct answer: 18

There are 6 choices of pen colour, and for each chosen pen colour there are 3 choices of highlighter colour. By the fundamental principle of counting, the total number of pairs is \(6 \times 3=18\). Option 9 results from adding the choices, but choices made from two separate groups are multiplied, not added. Exam tip: Multiply the number of choices at successive independent stages.

Related tags

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

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