Question

Cum se rezolva ex 1+2+3......+100

Answer 1

Suma lui Gauss

S= (1+100)* 100  / 2 =101*100/2=101*50=5050

Answer 2

$\displaystyle 1+2+3+...+100= \frac{100(100+1)}{2} = \frac{100 \times 101}{2} = \frac{10100}{2} =5050$