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In a class, there are 4 monitor candidates and 3 assistant-monitor candidates. In how many ways can one monitor and one assistant monitor be chosen?

Answer and explanation

Correct answer: 12

The governing concept is the fundamental principle of counting. If a procedure has successive independent stages, and every choice at one stage can be paired with every choice at the next stage, the total number of outcomes is found by multiplication. There are 4 possible choices for monitor. For each chosen monitor, there are 3 possible choices for assistant monitor. Hence the total is 4 × 3 = 12. The positions are distinct, so choosing candidate X as monitor and candidate Y as assistant monitor is a role assignment, not an unordered selection of five people. Option B, 7, incorrectly adds the choices. Options C and D do not follow the multiplication rule. Therefore option A is correct.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsSelectionRole AssignmentMathematicsClass 11 Mcq

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