Set, Relation and FunctionHard

Question

Let f : N → Y be a function defined as f (x) = 4x + 3, where Y = {y ∈ N : y = 4x + 3 for some x ∈ N}.
Show that f is invertible and its inverse is

Options

A.g(y) =  
B.g(y) = 4 +  
C.g(y) =
D.g(y) =

Solution

Function is increasing
x = = g(y)

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