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Please do the second problem like this please: https://www.chegg.com/homework-help/questions-and-answers/-q30886400 9. Prove by cases the following . (Va, Z)(z(z + 1) is even)

Please do the second problem like this please: https://www.chegg.com/homework-help/questions-and-answers/-q30886400

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9. Prove by cases the following . (Va, Z)(z(z + 1) is even)

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