Answer :

As, A = {1, 2, 3} and B = {4, 5, 6, 7}


f = {(1, 4), (2, 5), (3, 6)}


Clearly by observing f, we can say that each element of A is related to only 1 element of B.


14,25 and 35.


None of the element of A has two images in set B.


So, by f satisfies the definition of a one-one function


Function f is one-one.


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