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A computer set has (7) keyboard options and (2) mouse options. In how many ways can one keyboard and one mouse be chosen?

Answer and explanation

Correct answer: 14

For each of the 7 keyboard choices, there are 2 possible mouse choices. Therefore, by the fundamental principle of counting, the total number of selections is \(7 \times 2=14\). Adding them, \(7+2=9\), counts individual items, not keyboard-mouse pairs. Exam tip: Multiply the numbers of choices when one item is chosen from each separate group.

Related tags

Fundamental Counting PrinciplePermutations And CombinationsClass 11 MathematicsMultiplication RuleCounting PairsFundamental Principle Of CountingMathematicsClass 11 Mcq

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