Question

Ajutatima. 1+2+3+4+5+6+......+100=?
Dau coroana !!!!!!

Answer 1

$1 + 2 + 3 + ... + 10 0 = \\ \\ 100 \times 101 \div 2 = \\ \\ 10100 \div 2 = 5050$

Answer 2

 1 + 2 + 3 + ...+100 = 100 x 101 : 2 = 50 x 101 = 5050 

Gauss

1 + 2 + 3 + ...+ n = n (n + 1) : 2