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# DM-Groups and Lattice-Q11

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Let R be a relation from a set A to a set B. The inverse relation from B to A, denoted by $R^{-1}$, is the set of ordered pairs  $\{(b, a) | (a, b) \in R\}$.

S1: R is reflexive relation iff $R^ {-1} = R$

S2: R is a symmetric relation iff $R^ {-1} = R$

Which one of the following statements is true?

(A).Only S1

(B).Only S2

(C).Both S1 and S2

(D).None

asked Jul 8, 2019
reshown Jul 9, 2019