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निम्नलिखित सम्बन्धों में प्रत्येक का निर...

निम्नलिखित सम्बन्धों में प्रत्येक का निरीक्षण करके कारण सहित बताइए कि वह एक फलन है अथवा नहीं-
(i) `R_(1)` ={(2, 1), (3, 1), (4, 2)}
(ii) `R_(2)` = {(2, 2), (2, 4), (3, 3), (4, 4)}
(iii) `R_(3)` = {(1, 2), (2, 3), (3, 4), (4, 5), (5, 6), (6, 7)}
यदि सम्बन्ध एक फलन है, तो उसका प्रान्त और परिसर भी ज्ञात कीजिए ।

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