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Let S be the set of all triangles and R^...

Let `S` be the set of all triangles and `R^+` be the set of positive real numbers. Then the function `f: SrarrR^+,f(Delta)=area of Delta ,where Delta in S ,` is injective but not surjective. surjective but not injective injective as well as surjective neither injective nor surjective

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