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From numbers (1) to (18), how many ways are there to choose (4) even numbers?

Answer and explanation

Correct answer: 126

The even numbers from 1 to 18 are 2, 4, 6, 8, 10, 12, 14, 16 and 18, so there are 9 even numbers. Since the order of selecting 4 numbers does not matter, use combinations: \(\binom{9}{4}=126\). Therefore, the correct answer is 126. The value 3024 is related to permutations, where the order of selection is also counted. Exam tip: When items are “chosen” and no order is specified, usually use \(nCr\).

Related tags

CombinationsPermutations And CombinationsClass 11Even NumbersNcrSelectionMathematicsClass 11 Mcq

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