Question

Calculati suma: S=11+22+33+...+22154 VA ROG REPEDE E URGENT!!!!!!!!!!!!!!!

Answer 1

$\displaystyle 11+22+33+...+22154=11(1+2+3+...+2014)= \\ \\ =11 \times \frac{2014(2014+1)}{2} =11 \times \frac{2014 \times 2015}{2} = \\ \\ =11 \times \frac{4058210}{2} =11 \times 2029105=22320155$