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On Z, define R as follows: a, b in Z, ...

On Z, define R as follows:
`a, b in Z, aRb` if `7|(a^(2) -b^(2))`, then R is

A

reflexive and transitive only

B

reflexive and symmetric only

C

symmetric and transitive only

D

an equivalence relation

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The correct Answer is:
D
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