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यदि A = {a, b,c} और B = {1, 2, 3, 4} तो ...

यदि `A = {a, b,c}` और `B = {1, 2, 3, 4}` तो ज्ञात करो कि A से B पर निम्नलिखित फलन है या नहीं
(i) `f = {(a,1), (b, 2), (c,3 )}`, (ii) `f= {(a, 2), (b, 3), (c, 1), (b, 4)}`
(iii) `f= {(a, 4), (b, 4), (c, 1)}`
(iv) `f = {(a,1), (a, 2), (a, 3), (a, 4)}`
(v) `f = {(a, 2), (b, 2), (c, 2)}` (vi) `f = {(a, 3), (c, 1)}`

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