Let X = {x^2 : x ∈ N} and the function f : N → X is defined by f(x) = x^2,x ∈ N. Then this function is :
Let X = {x2 : x ∈ N} and the function f : N → X is defined by f(x) = x2,x ∈ N. Then this function is :
(a) injective only
(b) not bijective
(c) surjective only
(d) bijective
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