Question Number 189791 by normans last updated on 21/Mar/23
Answered by a.lgnaoui last updated on 22/Mar/23
$$\mathrm{20}\:{colors}\:{to}\:{distingue}\: \\ $$$$\mathrm{3}×\mathrm{3}+\mathrm{2}+\mathrm{2}×\mathrm{2}+\mathrm{5} \\ $$
Question-189791