Let `f: A to B; g: B to A` be two functions such that `gof = I_A`. Then; f is an injection and g is

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Let `f: A to B; g: B to A` be two functions such that `gof = I_A`. Then; f is an injection and g is a surjection.
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in the question it is asked that f: A - B and g: B- A and gof = Ia then and answer is = both are surjections plzz clear the doubt

teerthgajjar