Mathematics - Permutation & Combination Question with Solution | TestHub

Let $\mathrm{A}=\{1,2,3,4,5,6,7\}$. Then number of surjective functions defined from A to A such that $\mathrm{f}(\mathrm{i})=\mathrm{i}$ for atleast four values of i from $\mathrm{i}=1,2,\dots ,7$, is :