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From the numbers (1) to (12), (4) numbers are chosen so that their sum is even. How many selections are possible?

Answer and explanation

Correct answer: (255)

For an even sum, the number of odd selected numbers can be (0,2,4), giving (255). Focus on how many odd elements are selected, not only on total selection size.

Related tags

Class11CombinationsParitySum-EvenExpertPermutations And CombinationsMathematicsClass 11 Mcq

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