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From numbers (1) to (22), how many ways are there to choose (4) even numbers?

Answer and explanation

Correct answer: 330

The even numbers from 1 to 22 are 2, 4, 6, ..., 22, so there are 11 even numbers. Since the order of selection does not matter, use combinations: \(\binom{11}{4}=330\). Therefore, the correct answer is 330. The value 462 equals \(\binom{11}{5}\), so it does not represent choosing 4 numbers. Exam tip: first count the eligible numbers, then apply \(\binom{n}{r}\) for the required selection.

Related tags

CombinationsPermutations And CombinationsEven NumbersClass 11Binomial CoefficientMathematicsClass 11 Mcq

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