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In a 3-question test, the first question has 4 options, the second has 5 options, and the third has 3 options. One answer must be chosen for each question. How many answer patterns are possible?

Answer and explanation

Correct answer: 60 patterns

The governing idea is the fundamental principle of counting: when a task consists of successive independent choices, the total number of outcomes is the product of the numbers of choices at each stage. The first answer can be selected in 4 ways, the second in 5 ways, and the third in 3 ways. Therefore, the number of complete answer patterns is 4 × 5 × 3 = 20 × 3 = 60. Option B is correct because every choice for the first question can be paired with every choice for the second and third questions. Option A adds only some possibilities, while 45 and 75 do not result from the required multiplication.

Related tags

Fundamental Principle Of CountingIndependent ChoicesPermutations And CombinationsMathematicsClass 11 Mcq

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