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A colony gate pass has (2) pass types (7) colors and (3) validity-period options. How many gate passes can be made?

Answer and explanation

Correct answer: 42

For each pass type, there are 7 colour choices, and for each colour, there are 3 validity-period choices. Therefore, by the fundamental principle of counting, the total number of passes is \(2 \times 7 \times 3=42\). Adding \(2+7+3=12\) is incorrect because these options are selected together, not as alternatives. Exam tip: Multiply the numbers of choices when independent selections are made in sequence.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsClass 11 MathematicsMultiplication PrincipleCounting TechniquesMathematicsClass 11 Mcq

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