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Let f : {1, 2, 3}->{a , b , c}be one-one...

Let `f : {1, 2, 3}->{a , b , c}`be one-one and onto function given by `f (1) = a`, `f (2) = b`and `f (3) = c`. Show that there exists a function `g : {a , b , c}->{1, 2, 3}`such that `gof=I_x`and `fog=

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