Question

ajutati-maaaaaaaaaaaaaaaa!!! (1+2+3+.......+2743):2743

Answer 1

$\displaystyle (1+2+3+...+2743):2743= \frac{2743(2743+1)}{2} :2743= \\ \\ = \frac{2743 \cdot 2744}{2} :2743= \frac{7526792}{2} :2743=3763396:2743=1372$