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कारण सहित बतलाइए कि क्या निम्नलिखित फलनो...

कारण सहित बतलाइए कि क्या निम्नलिखित फलनों के प्रतिलोम हैं :
(i) `f: {1,2,3,4} to {10}` जहाँ
`f={(1,10),(2,10),(3,10),(4,10)}`
(ii) `g :{5,6,7,8} to {1,2,3,4} जहाँ
`g = {(5,4),(6,3),(7,4),(8,2)}`
(iii) `h : {2,3,4,5} to { 7,9,11,13}` जहाँ
`h = {(2,7),(3,9),(4,11),(5,13)}`

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