Question: Determine whether f : Z times Z - > Z is onto if f ( m , n ) = 2 m n .

Determine whether f : Z \times Z -> Z is onto if
f (m, n)=2m n.
f (m, n)= m2 n2.
f (m, n)= m + n +1.
f (m, n)=|m||n|.
f (m, n)= m24.

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