Discrete Math Question:

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

c) f(a, b) = |b|

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The value of ⌊1/2.⌊5/2⌋ ⌋ is _______________. a) 1 b) 2 c) 3 d) 0.5	The domain of the function that assign to each pair of integers the maximum of these two integers is ________. a) N b) Z c) Z + d) Z+ X Z+