Question

Suma Gauss la: 1+2+3+...+50

Answer 1

suma lui gauss are formula: [n(n+1)]/2 deci rezultatul la problema ta este:
     (50*51)/2 = 1275

Answer 2

$\displaystyle 1+2+3+...+50 = \\ \\ \boxed{\frac{n(n+1)}{2} } \\ \text{n= ultimul numar din sir.} \\ \\ \frac{50(50+1)}{2}= \frac{\not50\cdot51}{\not2}= 25\cdot51 = 1275$