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For all integers x, if (x ^2 + y^2) is not equal to 0 (mod 4),...

For all integers x, if (x ^2 + y^2) is not equal to 0 (mod 4), then x is odd or y is odd. Write the contrapositive of this statement. Write the contrapositive of this statement. Write the negation of this statement. c. Prove this statement using a proof by contraposition or a proof by contradiction?

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