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In each of the follwing cases, state whether the function is one-one, onto or bijective. Justify your answer. $\begin{array}{1 1} (i) \: f: R \rightarrow R\: defined\: by \ f(x)=3-4x \\ (ii)\: f: R \rightarrow R\: defined\: by \ f(x)=1+x^2 .\end{array} $

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