Question: Question 2 : Determine whether the function f : Z times Z - > Z is onto if ( a ) f ( m

Question 2:
Determine whether the function f : Z \times Z -> Z is onto if
(a) f (m, n)=2m n
(b) f (m, n)= m2 n2
(c) f (m, n)= m + n +1
(d) f (m, n)=|m||n|
(e) f (m, n)= m24

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