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(3) numbers are to be selected from (1) to (20). Their product must be even and their sum must be odd. How many selections are possible?

Answer and explanation

Correct answer: (450)

For the sum to be odd and the product to be even, exactly (1) odd and (2) even numbers must be chosen. Classify parity conditions first.

Related tags

Number-SelectionParityProduct-SumFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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