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For a relation R in a set A to be called $\mathbf{symmetric}$, if $(a_1,a_2) \in R$, which of the following must also be true

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ANSWER: $(a_2,a_1)\in R$. A relation R in a set A is called  $\mathbf{symmetric}$, if $(a_1,a_2) \in R\;\Rightarrow\; (a_2,a_1)\in R \; for \;a_1,a_2 \in A$
answered Mar 8, 2013 by balaji.thirumalai

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