Question

rezultatul calculilui (1+2+3+4+5.....+19):10

Answer 1

(1+2+3+4+5+......+19) :10
$\frac{n(n+1)}{2} = \frac{19*20}{2}=190$
190:10=19

Answer 2

(1 + 2 + 3 + 4 + 5 + ... + 19) : 10 = 
19 * 20/2 : 10 =
19 * 10 : 10
19