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A student ID has (4) department codes and (25) serial-number options. How many IDs can be made by choosing one department code and one serial number?

Answer and explanation

Correct answer: 100

By the fundamental principle of counting, each of the 4 department codes can be paired with any of the 25 serial numbers. Hence, the total number of IDs is \(4 \times 25=100\). Getting \(29\) would mean adding the choices, but an ID requires both a code and a serial number, so the choices must be multiplied. Exam tip: multiply the numbers of choices when one choice is made at each successive stage.

Related tags

Fundamental Principle Of CountingMultiplication RulePermutations And CombinationsClass 11 MathematicsCounting IdsMathematicsClass 11 Mcq

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