Which of the following function f: Z X Z → Z is not onto?a.f(a, B) = a + bb.f(a, B) = ac.f(a, B) = a – bd.f(a, B) = |b|
Question
Solution 1
The function that is not onto is d. f(a, B) = |b|.
Here's why:
An onto function (or surjective function) is a function where every element in the range is mapped to by at least one element in the domain. In other words, every possible output value is produced by at least one input value.
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