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From the numbers 1 to 24, how many ways are there to choose 3 odd and 2 even numbers?

Answer and explanation

Correct answer: 14520

The relevant principle is to count the odd and even selections separately and then multiply them. From 1 through 24 there are 12 odd numbers and 12 even numbers. The number of ways to choose 3 odd numbers is C(12,3) = 12 × 11 × 10 ÷ 6 = 220. The number of ways to choose 2 even numbers is C(12,2) = 12 × 11 ÷ 2 = 66. Because a valid selection requires both an odd group and an even group, the multiplication rule gives 220 × 66 = 14,520. Hence option C is correct. The other choices do not equal the product of the two required combinations and therefore omit or miscount some selections.

Related tags

CombinationsOdd Even SelectionMultiplication RulePermutations And CombinationsMathematicsClass 11 Mcq

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