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
Correct Answer

B. ( (2,1) ) missing है( (2,1) ) is missing

Step 1

Concept

Here \((1,2)\in R\), but the reverse pair ( (2,1) ) is absent. A reverse pair is necessary for symmetry.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

यदि \(R=\{(1,2)\}\) है, तो (R) symmetric क्यों नहीं है? / If \(R=\{(1,2)\}\), why is (R) not symmetric?

Correct Answer: B. ( (2,1) ) missing है / ( (2,1) ) is missing. 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.

Which concept should I revise for this Mathematics MCQ?

Here \((1,2)\in R\), but the reverse pair ( (2,1) ) is absent. A reverse pair is necessary for symmetry.

What exam hint can help solve this Mathematics question?

\((1,2)\in R\) है लेकिन उल्टा pair ( (2,1) ) नहीं है। Symmetric के लिए reverse pair जरूरी है।