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Let X = {1, 2, 3, 4}, Y = {a, b, c, d) and f = {(1, a), (4, b), (2, c), (3, d) (2, d)}. Then f is …..

(a) An one-to-one function 

(b) An onto function 

(c) A function which is not one-to-one 

(d) Not a function

1 Answer

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Best answer

(d) Not a function

Since the element 2 has two images, it is not a function

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