यदि \(R=\{(1,2)\}\) है, तो (R) symmetric क्यों नहीं है?
If \(R=\{(1,2)\}\), why is (R) not symmetric?
Explanation opens after your attempt
B. ( (2,1) ) missing है( (2,1) ) is missing
Simple Explanation
\((1,2)\in R\) है लेकिन उल्टा pair ( (2,1) ) नहीं है। Symmetric के लिए reverse pair जरूरी है। / Here \((1,2)\in R\), but the reverse pair ( (2,1) ) is absent. A reverse pair is necessary for symmetry.
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