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Let A = {1,3,4,7,11} , B = {-1,1,2,5,7,9...

Let A = {1,3,4,7,11} , B = {-1,1,2,5,7,9} and f : A `rarr` B be given by
f = {(1,-1),(3,2),(4,1),(7,5),(11,9)}
then f is ............ .

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