Mathematics - Functions Question with Solution | TestHub

The number of the functions f from the set $\mathrm{X}=\{1,2,3\}$ to the Y=\{1,2,3,4,5,6,7\} such that $\mathrm{f}(\mathrm{i})\le \mathrm{f}(\mathrm{j})$ for $\mathrm{i}<\mathrm{j}$ and $\mathrm{i},\mathrm{j}\in \mathrm{X}$ is