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
Concept
Here \((1,2)\in R\), but the reverse pair ( (2,1) ) is absent. A reverse pair is necessary for symmetry.
Why this answer is correct
The correct answer is B. ( (2,1) ) missing है / ( (2,1) ) is missing. Here \((1,2)\in R\), but the reverse pair ( (2,1) ) is absent. A reverse pair is necessary for symmetry.
Exam Tip
\((1,2)\in R\) है लेकिन उल्टा pair ( (2,1) ) नहीं है। Symmetric के लिए reverse pair जरूरी है।
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