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From the numbers 1 to 36, 3 numbers that are multiples of 4 and 2 numbers that are not multiples of 4 are to be selected. How many ways are there?

Answer and explanation

Correct answer: 29484

The governing concept is the multiplication principle applied to independent combinations. From 1 through 36, the multiples of 4 are 4, 8, 12, ..., 36, so their number is 36/4 = 9. Consequently, the number of non-multiples of 4 is 36 - 9 = 27. The required selection consists of 3 numbers from the first group and 2 from the second group. Since order does not matter within either group, the count is C(9,3) × C(27,2). Now C(9,3) = 84 and C(27,2) = 351, giving 84 × 351 = 29,484. Therefore option B is correct. The other options can result from using incorrect group sizes, using an inappropriate permutation count, or failing to multiply the two independent choices.

Related tags

CombinationsProduct RuleMultiplesPermutations And CombinationsMathematicsClass 11 Mcq

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