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Let f: A to B and g: B to C be two funct...

Let `f: A to B` and `g: B to C` be two functions. Then; (i)if `gof` is onto then g is onto; (ii)if `gof` is one one then `f` is one-one and (iii)if `gof `is onto and `g` is one one then `f` is onto (iv) if `gof` is one one and `f` is onto then `g` is one one.

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