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At a refreshment counter there are (9) drinks and (4) biscuit packs. In how many ways can one drink and one pack be chosen?

Answer and explanation

Correct answer: 36

There are 9 choices for the drink. For each selected drink, there are 4 choices for the biscuit pack. Therefore, by the fundamental principle of counting, the total number of selections is \(9 \times 4=36\). Option 13 results from adding the numbers of items, but a drink and a pack form a pair, so multiplication—not addition—is required. Exam tip: Multiply the choices when each option in one step can be combined with every option in the next step.

Related tags

Fundamental Principle Of CountingMultiplication PrinciplePermutations And CombinationsClass 11 MathematicsCounting SelectionsMathematicsClass 11 Mcq

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