Question

Coroana ! ! ! Calculati in Formula lui Gauss :
a ) 1 + 2 + 3 + . . . + 157

Answer 1

S=(157X158):2
S=24806:2
S=12403

Answer 2

$\displaystyle 1+2+3+...+157= \frac{157(157+1)}{2} = \frac{157 \times 158}{2} = \frac{24806}{2} =12403$