Question

calcule a soma dos naturais do 1 ao 521

Answer 1

PA (1, 2, 3, 4... 521)
a1 = 1
r = 1
an = 521

$Sn = \frac{(a1 + an)n}{2} \\ S521 = \frac{(1 + 521)521}{2} \\ S521 = \frac{522 \times 521}{2} \\ S521 = 135981$

Answer 2

a1 = 1
an = 521
razão r = 1

S521 = (a1 + an).n/2

S521 = (1 + 521).521/2

S521 = (522).521/2

S521 = 261.521

S521 = 135.981

Espero ter ajudado.