Question

2+4+6+....+100=
Va rog ajutati-ma :( :/

Answer 1

$\displaystyle 2+4+6+...+100=2(1+2+3+...+50)=2 \times \frac{50(50+1)}{2} = \\ \\ =2 \times \frac{50 \times 51}{2} =\not 2 \times \frac{2550}{\not 2} =2550$