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A music app has (7) playlists and (3) sound-quality options. In how many ways can one playlist and one quality option be chosen?

Answer and explanation

Correct answer: 21

There are 7 choices for the playlist, and for each selected playlist there are 3 choices for sound quality. By the fundamental principle of counting, the total number of choices is \(7\times3=21\). Option 10 comes from adding the numbers, which is incorrect here because two independent selections are being made. Exam tip: Multiply when every choice of one step can be paired with every choice of the next step.

Related tags

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

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