Given that, f :N → A defined by f (2n–1) = 0, f (2n) = 1,∀n ∈N,
We observe that for each element of A(co-domain) there exist a pre image in N(domain).
For 0 ∈ A there exist (2n-1),∀ n ∈N
For 1 ∈ A there exist (2n),∀ n ∈N
Thus, the mapping is onto.
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