Which of the following function f: Z X Z → Z is not onto?

1.	Which of the following function f: Z X Z → Z is not onto?
A.	f(a, b) = a + b
B.	f(a, b) = a
C.	f(a, b) = \|b\|
D.	f(a, b) = a – b
Answer» D. f(a, b) = a – b

Discussion

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