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नीचे दिए संबंधों में से प्रत्येक का नि...

नीचे दिए संबंधों में से प्रत्येक का निरीक्षण कीजिए और प्रत्येक दशा में कारण सहित बतलाइए कि क्या यह फलन है अथवा नहीं।
(i) R ={(2,1),(3,1),(4,2),(ii) R ={(2,2) ,(2,4),(3,3) ,(4,4)}
(iii) R={(1.2),(2,3),(3,4),(5,6),(6,7)}

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