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Define an onto function. Give one exampl...

Define an onto function. Give one example.
(A) A function `f:A to B` is said to be an onto function if `AA b in EE a in A` such that `f(a)=b` (or) if range of f = codomain of f then f is an onto function.
Ex. `f: R to R` such that `f(x) = 2x+3`

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