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An examination contains 6 short-answer questions and 4 long-answer questions. A student has to solve exactly one of them. In how many ways can the student choose the question?

Answer and explanation

Correct answer: 10

The student can choose one of the 6 short-answer questions or one of the 4 long-answer questions. These are mutually exclusive alternatives, so the addition rule applies: 6 + 4 = 10. The value 24 (= 6 × 4) would apply if the student had to choose both one short and one long question. Exam tip: add the counts for ‘or’ choices and multiply for combined ‘and’ choices.

Related tags

Permutations And CombinationsAddition RuleCounting PrincipleMutually Exclusive EventsCombinationsMathematicsClass 11 Mcq

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