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(4) integers are to be selected from (1) to (12). No two selected integers should be consecutive, and their sum must be even. How many selections are possible?

Answer and explanation

Correct answer: (66)

First consider non-consecutive selections of (4) numbers and then separate those with even sum. Parity classification helps in such questions.

Related tags

Number-SelectionNonconsecutiveParityFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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