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f: {1,2,3} to {a,b,c} ,f(1)= a,f(2) = b ...

`f: {1,2,3} to {a,b,c} ,f(1)= a,f(2) = b` तथा `f(3)=c`. द्वारा प्रदत्त फलन f पर विचार कीजिए। `f^(-1)` । ज्ञात कीजिए और सिद्ध कीजिए कि `(f^(-1))^(-1)` है

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