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From the numbers 1 to 48, 4 multiples of 6 and 2 non-multiples of 6 are to be selected. How many selections are possible?

Answer and explanation

Correct answer: 54600

The governing principle is the product rule together with combinations, because the required selection is split into two disjoint groups. The multiples of 6 from 1 through 48 are 6, 12, ..., 48, so there are 48/6 = 8 such numbers. The remaining 48 - 8 = 40 numbers are non-multiples of 6. We must choose 4 from the first group and 2 from the second, without regard to order. Therefore the number of selections is C(8,4) × C(40,2). Now C(8,4) = 70 and C(40,2) = 40×39/2 = 780, so the product is 70 × 780 = 54,600. Hence option D is correct. Permutations would overcount each selection because rearranging its members does not create a new selection.

Related tags

CombinationsMultiplesProduct RulePermutations And CombinationsMathematicsClass 11 Mcq

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