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In a class activity there are (9) groups and (3) presentation topics. In how many ways can one group and one topic be matched?

Answer and explanation

Correct answer: 27

By the fundamental principle of counting, there are 9 choices for the group and 3 choices for the topic. Therefore, the total number of matches is \(9 \times 3=27\). The value 12 comes from \(9+3\), but independent choices are multiplied, not added. Exam tip: For successive choices connected by “and”, usually multiply the numbers of choices.

Related tags

Fundamental Principle Of CountingMultiplication RulePermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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