Let A = B = {1, 2, 3}, and consider the function f: A ? B defined as follows: f(1) = 3, f(2) = 1, f(3) = 3. Is f onto? Why or why not?
What will be an ideal response?
f is not onto because there is an element of the co-domain B, namely 2, that is not the image of any element in the domain.
Mathematics
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