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निम्नलिखित संबंधो में कौन से फलन है ? का...

निम्नलिखित संबंधो में कौन से फलन है ? कारण का उल्लेख कीजिए । यदि संबंध एक फलन है , तो उसका परिसर निर्धारित कीजिए :
(i) {(2,1), (5,1),(8,1),(11,1),(14,1),(17,1)}
(ii) {(2,1),(4,2),(6,3),(8,4),(10,5),(12,6),(14,7)}
(iii) {(1,3),(1,5),(2,5)}.

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