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December 24th, 2017, 02:48 AM   #1
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Equivalence Relation

I have come across a question as "The number of equivalence relations that can be defined on a set with two elements is " and same question for 3 elements as well.

Since I have the answers with me I am thinking the possible general term would be $\displaystyle 2^n - n$

Someone correct me
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December 24th, 2017, 07:22 AM   #2
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In general, it's not $2^n - n$.
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