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If the matrix of a relation on (A={1,2,3}) is (M=\begin{bmatrix}1&1&0\0&1&1\0&1&1\end{bmatrix}), is the relation symmetric?

Answer and explanation

Correct answer: No, because (m_{12}\ne m_{21})

Step 1: For symmetry in a relation matrix, we need (m_{ij}=m_{ji}). Step 2: Here (m_{12}=1) but (m_{21}=0), so the condition fails. Step 3: Do not decide by the diagonal alone; compare entries on both sides of it.

Related tags

Relation MatrixSymmetric RelationNon SymmetricClass 12Relations And FunctionsMathematicsClass 12 Mcq

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