Question

lm giup vs

2+4+6+....+998

Thank:333

Answer 1

\(2+4+6+...+998\)

\(=\dfrac{\left(998+2\right)\left(\dfrac{998-2}{2}+1\right)}{2}\)

\(=249500\)

Answer 2

2 + 4 + 6 + ... + 998

=>    (998 + 2) (\(\dfrac{998-2}{2}\) + 1 )

=>      249500