Question

Calculati suma numerelor naturale de la 1 la 100.

Answer 1

1+2+3+....+100=

=(100×101)/2=

=50×101=5050

Answer 2

S= 1+2+3+...+100

S=$\frac{n(n+1)}{2}$

S=$\frac{100(100+1)}{2}$

S=$\frac{100*101}{2}$  (simplificam 100 cu 2)

S=50*101

S=5050