Question

DAU COROANA
rezolvati 1+2+3+.....+73=?
Va rog repedee !!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$\displaystyle 1+2+3+...+73= \frac{73(73+1)}{2} = \frac{73 \cdot 74}{2} = \frac{5402}{2} =2701$

Answer 2

1+2+3+...+73= 73*(74:2)=73*37= 2701