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Mathematics, 02.10.2019 22:30 sarah8479

Use a proof by cases to show that every perfect square is either a multiple of four or one more than a multiple of four. hint you only need two cases! 2. use a proof by cases to show that if two integers are both odd or both even, then their sum is always even 3. use a proof by contraposition to show that if the sum of two numbers is odd then exactly one of the two numbers must be odd.

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