Which of the following is an equivalence relation on R, for a, b ∈ Z

1.	Which of the following is an equivalence relation on R, for a, b ∈ Z?
A.	(a-b) ∈ Z
B.	(a²+c) ∈ Z
C.	(ab+cd)/2 ∈ Z
D.	(2c³)/3 ∈ Z
Answer» C. (ab+cd)/2 ∈ Z

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Which of the following is an equivalence relation on R, for a, b ∈ Z?

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