Question

CUM SE REZOLVA EXERCITIUL URMATOR: 1+2+3+...+124=?

Answer 1

(1+124)*124 totul impartit la 2=7750

Answer 2

$\displaystyle 1+2+3+...+124= \frac{124(124+1)}{2} = \frac{124 \times 125}{2} = \frac{15500}{2} =7750$