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From 5 science and 6 arts students, in how many ways can 1 science student and 3 arts students be selected?

Answer and explanation

Correct answer: 100

Because only a group is being selected and not arranged, combinations are required. Choose one science student from five in C(5,1) = 5 ways. Next choose three arts students from six in C(6,3) = 6!/(3!3!) = 20 ways. These two choices are independent: each science selection can be paired with every valid arts selection. By the multiplication principle, the total is C(5,1) × C(6,3) = 5 × 20 = 100. Therefore option C is correct. Adding the two counts would not form a complete four-student group, and no permutation factor is needed because rearranging the selected students does not create a new selection. Options A, B, and D do not result from the required combination product.

Related tags

CombinationsStudent-SelectionMultiplication-PrincipleCountingPermutations And CombinationsMathematicsClass 11 Mcq

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