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An exam portal has 4 sections. The first 3 sections have 5, 4, and 6 questions respectively, and the fourth has 3 difficult and 2 easy questions. If 1 question is chosen from each section and the fourth must be easy, how many selections are possible?

Answer and explanation

Correct answer: 240

The governing concept is the fundamental principle of counting: when independent choices are made in succession, the total number of outcomes is the product of the choices at each stage. From the first, second, and third sections there are 5, 4, and 6 choices. The fourth section must contribute an easy question, so only 2 choices are available, not all 5 questions. Therefore the number of selections is 5 × 4 × 6 × 2 = 20 × 12 = 240. Hence option A is correct. The difficult questions are excluded by the condition, so using 3 or 5 for the fourth factor would overcount; the other numerical options do not follow the required product.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsMultiplication RuleSelectionMathematicsClass 11 Mcq

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