Question

CALCULATI URMATOARELE SUME


2+4+6+.......+1000 VA ROG SA MA AJUTATI multumesc!

Answer 1

$\displaystyle 2+4+6+...+1000=2(1+2+3+...+500)=2 \times \frac{500(500+1)}{2} = \\ \\ =2 \times \frac{500 \times 501}{2} =\not 2\times \frac{250500}{\not2} =250500$