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If (R) and (S) are symmetric relations, which additional condition is sufficient for (R\circ S) to be symmetric?

Answer and explanation

Correct answer: (R\circ S=S\circ R)

Step 1: For inverse relations, ((R\circ S)^{-1}=S^{-1}\circ R^{-1}). Step 2: Since (R) and (S) are symmetric, (R^{-1}=R) and (S^{-1}=S), so ((R\circ S)^{-1}=S\circ R). Step 3: If (R\circ S=S\circ R), then the composite equals its inverse and is symmetric.

Related tags

Composition Of RelationsSymmetric RelationInverse RelationExpertRelations And FunctionsMathematicsClass 12 Mcq

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