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An exam center has 3 entry gates and 4 seating rooms. How many ways are there to choose one gate and one room?

Answer and explanation

Correct answer: 12 ways

The fundamental principle of counting says that when a complete outcome is formed through successive independent choices, the numbers of choices are multiplied. Selecting an entry gate gives 3 possibilities. For each selected gate, the seating room can be chosen in 4 ways. Therefore the number of gate-room pairs is 3 × 4 = 12, so option C is correct. The result 7 comes from adding the two numbers, which would not count a pair consisting of both a gate and a room. The values 9 and 16 do not follow from the stated two-stage process. The multiplication includes every possible gate with every possible room and therefore gives the exact number of valid selections.

Related tags

Fundamental-Principle-Of-CountingMultiplication-PrinciplePaired-ChoicesFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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