Let R be a relation on the set of all integers such that aRb if and only if a + b is even. To show that R is symmetric, we must prove that For any integers a and b, if a + b is odd, then b + a is even O For any integers a and b, if a + b is even, then b + a is even O For any integers a and b, if a + b is odd, then b + a is odd O For any integers a and b, if a + b is even, then b + a is odd To show that R is not symmetric, we must find a counterexample satisfies which of the following statement? O For some integers a and b, a + b is even and b + a is odd O For some integers a and b, a + b is even and b + a is even O For some integers a and b, a + b is odd and b + a is odd O For some integers a and b, a + b is odd or b + a is even Note: In order to get credit for this problem all answers must be correct.

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