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 – bThis question was posed to me during an online exam.My question comes from Functions in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Which of the following function f: Z X Z → Z is not onto?(a) f(a, b)

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 – bThis question was posed to me during an online exam.My question comes from Functions in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
Answer» Right choice is (C) f(a, B) = \|b\| The best I can EXPLAIN: The function is not onto as f(a)≠b.

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