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A student can buy one pen from (4) pens and one notebook from (5) notebooks or one pencil from (3) pencils. How many total options are possible?

Answer and explanation

Correct answer: (23) विकल्प

The governing concept is the addition and multiplication principles used together for mutually exclusive cases. In the first case, the student buys a pen and a notebook, so there are 4 × 5 = 20 possible pairs. In the second case, the student buys one pencil, giving 3 possibilities. These cases are alternatives: a purchase in the first case is not the same type of choice as a pencil-only purchase, so their counts are added. Hence total options = 20 + 3 = 23, making option A correct. Option B counts only the first case, option C multiplies 4 by 3 and ignores notebooks, and option D adds all raw item counts without forming pairs.

Related tags

Fundamental-Principle-Of-CountingAddition-And-Multiplication-PrinciplesClass-11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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