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A mobile app has (3) themes (4) fonts and (5) icon sets. If a user chooses one each how many interfaces can be made?

Answer and explanation

Correct answer: 60

Choosing one theme, one font, and one icon set involves independent choices. By the fundamental principle of counting, the total number of interfaces is \(3 \times 4 \times 5=60\). Option 12 results from calculating only \(3 \times 4\) and ignores the 5 icon-set choices. Exam tip: multiply the numbers of choices when every choice at one stage can be paired with every choice at the next stage.

Related tags

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

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