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From the numbers 1 to 30, how many ways are there to choose 3 odd and 3 even numbers?

Answer and explanation

Correct answer: 207025

The governing concept is multiplication of independent combinations formed from disjoint subsets. The integers from 1 to 30 contain 15 odd numbers and 15 even numbers. The number of ways to choose 3 odd numbers is C(15,3) = 15×14×13/(3×2×1) = 455. Independently, the number of ways to choose 3 even numbers is also C(15,3) = 455. Every valid odd-number selection can be paired with every valid even-number selection, so the total is C(15,3) × C(15,3) = 455 × 455 = 207,025. Thus option C is correct. Choosing any six numbers by C(30,6) would ignore the parity condition, while the other listed values arise from incorrect multiplication or incomplete counting.

Related tags

CombinationsOdd EvenSelectionPermutations And CombinationsMathematicsClass 11 Mcq

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