Let f(x): {x, x is rational {0, x is irrational and g(x): {0, x is rational {x, x is irrational If f : R → R and g : R → R, then (f - g) is - NDA Mathematics 2017 (I)

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Let f(x): {x, x is rational {0, x is irrational and g(x): {0, x is rational {x, x is irrational If f : R → R and g : R → R, then (f – g) is