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Which of the following relations R in th...

Which of the following relations R in the set Zof integers is not an equivalence relation?
(A) R={(a,b); 3 divides (a - b)
(B) R={(a,b); 2 divides (a - b)
(C) R= {(a,b): 2 divides (a +b)
(D) R = {(a,b): 3 divides (a +b)

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