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(B) Since $R$ is an equivalence relation on set $A$,it must be reflexive,symmetric,and transitive.By the definition of a reflexive relation,for every

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Greater than or equal to $n$

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(B) Since $R$ is an equivalence relation on set $A$,it must be reflexive,symmetric,and transitive.By the definition of a reflexive relation,for every element $a \in A$,the ordered pair $(a, a)$ must belong to $R$.Since the set $A$ has $n$ elements,there are at least $n$ such ordered pairs of the form $(a, a)$ in $R$.Therefore,the total number of ordered pairs in $R$ must be greater than or equal to $n$.

Let $R$ be an equivalence relation on a finite set $A$ having $n$ elements. Then the number of ordered pairs in $R$ is

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