Question

Calculeaza:
S=1+2+...+100

Answer 1

Suma Gauss  : (A1+An) x n supra 2.
n = An-Ai, supra r + 1
n = (100-1):1+1 = 100

(1+100) x 100:2 = > 101 x 50 = 5050. Chiar atat da.

Answer 2

S=1+2+3+..+100
S= $\frac{100*101}{2}$
S=$\frac{10100}{2}$
S=5050