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A student chooses one each from (4) optional subjects and (9) project topics. How many selections are possible?

Answer and explanation

Correct answer: 36

For each of the 4 optional subjects, any one of the 9 project topics can be chosen. Therefore, by the fundamental principle of counting, the total number of selections is \(4 \times 9=36\). Adding, \(4+9=13\), only gives the total number of available items, not the number of subject–project pairs. Exam tip: When one choice is made at each of two independent stages, multiply the numbers of choices.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsMultiplication RuleClass 11 MathematicsMathematicsClass 11 Mcq

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