Question

calcular P=1+2+3+,,,,,,+20 aiudaaaa D; como se resuleve?

Answer 1

Resolución

Aplicar formula de suma susesiva

$\frac{20(20 + 1)}{2}$

$\frac{20(21)}{2}$

$\frac{420}{2}$

$210$

R = 210