Răspuns :
[tex]1 + 2 + 3 + ... + 10 0 = \\ \\ 100 \times 101 \div 2 = \\ \\ 10100 \div 2 = 5050[/tex]
1 + 2 + 3 + ...+100 = 100 x 101 : 2 = 50 x 101 = 5050
Gauss
1 + 2 + 3 + ...+ n = n (n + 1) : 2
Gauss
1 + 2 + 3 + ...+ n = n (n + 1) : 2