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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)=a r e aof Delta ,w h e r e in S ,` is injective but not surjective. surjective but not injective injective as well as surjective neither injective nor surjective

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