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Which of the following are equivalence r...

Which of the following are equivalence relations on `A={4,6,8}` ?
(A) `{(4,4),(6,6),(8,8),(4,6),(6,4)}`
(B) `{(4,4),(6,6),(8,8),(5,6)}`
(C )`{(4,4),(6,6),(8,8),(4,8),(8,6)}`
(D) `{(4,4),(6,6),(8,8),(4,8),(8,4)}`

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The correct Answer is:
(A,D)
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