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A language lab has (5) language options (3) practice levels and (2) recording modes. How many practice sets can be formed?

Answer and explanation

Correct answer: 30

For each practice set, choose one of 5 languages, one of 3 practice levels, and one of 2 recording modes. By the fundamental principle of counting, the total number of sets is \(5 \times 3 \times 2=30\). The value \(15\) counts only the language and level choices and ignores the recording mode. Exam tip: multiply the numbers of choices at independent stages.

Related tags

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

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