(A) is an equivalence relation but is not an equivalence relation
(B)Neither nor is an equivalence relation
(C) is an equivalence relation but is not an equivalence relationCorrect
(D) and both are equivalence relations
Answer: (C)
Solution
Test : for some rational .
Taking gives , so for every real .
But for , would need , which is false. So is not symmetric, hence not an equivalence relation.
Test
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