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f(x)={(x", if x is rational"),(0", ...

`f(x)={(x", if x is rational"),(0", if x is irrational"):}, g(x)={(0", if x is rational"),(x", if x is irrational"):}` Then, `f-g` is (A) one-one and onto (B) one-one but nor onto (C) onto but not one-one (D) neither one-one nor onto

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