Question

Calcule a soma dos 50 primeiros termo da P.A. (2,6,10…)

Answer 1

an = 2 + (50 - 1) x 4
an = 2 + 200 - 4
an = 2 +196
an = 198

Sn = ((2 + 198) x 50)/2
Sn = (200 x 50)/2
Sn = 10000/2
Sn = 5000

Answer 2

P.A = (2,6,10...)

An = 2 + (50 - 1) x 4
an = 2 + 200 - 4
an = 2 +196
an = 198

Sn = ((2 + 198) x 50)/2
Sn = (200 x 50)/2
Sn = 10000/2
Sn = 5000

Espero ter ajudadoo!!