Question

X = 1+2+3+4+.........+1234
Aflati x

Answer 1

$x=1+2+3+...+1234$

$x=1234+1233+1232+...+1$

$2x=1235+1235+...+1235(1234 \ termeni)$

$x=\frac{1235*1234}{2}=761995$

Answer 2

x=1+2+3+4+......+1234
x=1234+1233+1232+...+1
2x=1235+1235+...+1235
x={1235•1234}{2}=761995