Question

Calcule a soma dos naturais de 1 á 30

Answer 1

PA (1, 2, 3, 4... 30)
a1 = 1
r = 1
a30 = 30

$Sn = \frac{(a1 + an)n}{2} \\ S30 = \frac{(1 + 30)30}{2} \\ S30 = 31 \times 15 \\ S30 = 465$