Question

Calculati x din proportia:
$\frac{x}{25025}$=$\frac{1*2+2*3+3*4+...+2003*2004}{5*10+10*15+15*20+...+10015*10020}$

Answer 1

x/25025 = (1·2 +2·3 +......+2003·2004) / [5²(1·2 + 2·3 +......+2003·2004)]
x/25025 = 1/25    x = 25025 /25 = 1005