Question

Determina la suma de 5 + 10 + 15 + 20 + 25... + 500

Answer 1

a1 = 5

n = 500

an = 500

Sn = (a1 + an)/2 * n

Sn = (5 + 500)/2 * 500

Sn = (505)/2 * 500

Sn = 505 * 250

Sn = 126250