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

f : { 1,2,3} `to` { a, b ,c} , f (1) = a, f (2) = b , f (3) = c व्दारा प्रदत्त फलन हैं । दर्शाइये कि - `(f^(-1))^(-1)` = f .

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