Assertion (A) : A function f : N $\rightarrow$ N given by f(x) = $x^3$ + 2, $\forall$ x $\in$ N is one-one but not onto. Reason (R) : Since $\forall$ y $\in$ N (Codomain), there does not exist x = (y - 2)$^{1/3}$ in N (Domain) such that f(x) = $x^3$ + 2 = y.