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माना कि A = { 1,2,3 } , B = { 4,5,6,7 } ...

माना कि A = { 1,2,3 } , B = { 4,5,6,7 } तथा f = { (1, 4 ) , ( 2,5 ) , ( 3,6 ) } A से B तक एक फलन है । सिद्ध कीजिए कि f एकैकी हैं ।

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