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

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

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a) (a-b) ∈ Z
b) (a2+c) ∈ Z
c) (ab+cd)/2 ∈ Z
d) (2c3)/3 ∈ Z
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