क्या हर सममित संबंध (R) के लिए \(R\circ R\) भी सममित होगा?
For every symmetric relation (R), will \(R\circ R\) also be symmetric?
Correct answer and explanation
A. हाँ, हमेशाYes, always
Concept
मानिए \((a,c)\in R\circ R\), तब कोई (b) है जिससे (aRb) और (bRc)। / Suppose \((a,c)\in R\circ R\). Then there is some (b) such that (aRb) and (bRc).
Why this answer is correct
(R) सममित है, इसलिए (cRb) और (bRa), अतः \((c,a)\in R\circ R\)। / Since (R) is symmetric, (cRb) and (bRa), so \((c,a)\in R\circ R\).
Exam Tip
प्रमाण में बीच के अवयव को उल्टी दिशा में उपयोग करना याद रखें। / In such proofs, reuse the intermediate element in the reverse direction.
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