Question

CINE MA AJUTA SA CALCULEZ ACEASTA PROBLEMA DE MATEMATICA? 2+4+6+..+100=?

Answer 1

2+4+6+...+100=2 x (1+2+3+...+50)= 2 x [(50 x 51)/2]= 50 x 51= 2550

Answer 2

$\displaystyle 2+4+6+...+100=2(1+2+3+...+50)=2 \times \frac{50(50+1)}{2} = \\ \\ =2 \times \frac{50 \times 51}{2} =\not2 \times \frac{2550}{\not2} =2550$