Question Number 195107 by Rupesh123 last updated on 24/Jul/23
Answered by JDamian last updated on 24/Jul/23
$$\mathrm{5}+\mathrm{15}+\mathrm{25}+\:\centerdot\centerdot\centerdot\:+\mathrm{975}+\mathrm{985}+\mathrm{995}= \\ $$$$=\frac{\mathrm{100}}{\mathrm{2}}\left(\mathrm{5}+\mathrm{995}\right)=\mathrm{50000} \\ $$