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 anti-symmetric, we must prove that For any integers a and b, if ab, then a + b is even and b + a is even For any integers a and b, if a + b, then a + b is even or b + a is even For any integers a and b, if ab, then a + b is odd or b+a is odd For any integers a and b, if ab, then a + b is odd and b + a is odd O For any integers a and b, if a + b is even, then b + a is even To show that R is not anti-symmetric, we must find a counterexample satisfies which of the following statement? For some integers a and b, a + b and a + b is odd and b + a is odd For some integers a and b, a + b and a + b is odd or b + a is odd For some integers a and b, a + b and a + b is even or b + a is even For some integers a and b, a b and a + b is even and b + a is even For some integers a and b, a + b is even and b + a is odd

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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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 anti-symmetric, we must prove that

For any integers a and b, if ab, then a + b is even and b + a is even

For any integers a and b, if a + b, then a + b is even or b + a is even

For any integers a and b, if ab, then a + b is odd or b+a is odd

For any integers a and b, if ab, then a + b is odd and b + a is odd

O For any integers a and b, if a + b is even, then b + a is even

To show that R is not anti-symmetric, we must find a counterexample satisfies which of the following statement?

For some integers a and b, a + b and a + b is odd and b + a is odd

For some integers a and b, a + b and a + b is odd or b + a is odd

For some integers a and b, a + b and a + b is even or b + a is even

For some integers a and b, a b and a + b is even and b + a is even

For some integers a and b, a + b is even and b + a is odd 

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