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Which of the following relation is a partial order as well as an equivalence relation?

Which of the following relation is a partial order as well as an equivalence relation? Correct Answer equal to(=)

The identity relation = on any set is a partial order in which every two distinct elements are incomparable and that depicts the relation of both a partial order and an equivalence relation. For non-linear orders, there are many advanced properties of posets.

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