Let N be the set of natural numbers and two functions f and g be defined as f, g: N → N such that $\text{f}\left(\text{n}\right)=\{\begin{array}{l}\frac{\mathrm{n}+1}{2},\mathrm{if}\mathrm{n}\mathrm{is}\mathrm{odd}\\ \frac{\mathrm{n}}{2},\mathrm{if}\mathrm{n}\mathrm{is}\mathrm{even}\end{array}$  and g(n) = n – (– 1)ⁿ. Then fog is