Question

2+4+6+8+10 +..................1000..Rezolva exercitiul ...!!!!

Answer 1

$2+4+6+8+...+1000=2(1+2+3+4+...+500)=2* \frac{500*501}{2}=$$500*501=250500$

Answer 2

2(1+2+3+4+5+.......500)=2X[(500X501)/2]=500X501=250500