Question

cum rezolv ecuatia 1+2+3+.....+n=36​

Answer 1

36=

$\frac{n \times (n + 1)}{2}$

=> n=8 ( efectuand fractia de mai sus )

Answer 2

1+2+3+...+n=36

n(n+1)/2=36

n(n+1)=36×2

n(n+1)=72

n(n+1)=8×9

n=8