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Exercise 4.7.2: Proofs by cases - even/odd integers and divisibility. About Prove each statement. (a) If x is an integer, then c2 + 5x 1 is odd. (b) If integers - and y have the same parity, then x + y is even. The parity of a number tells whether the number is odd or even. If x and y have the same parity, they are either both even or both odd (C) If integers x and y where x