Question

quantos termos tem a pg (4374, 1458, 486,....., 2)

Answer 1

resolução!

q = a2 / a1

q = 1458 / 4374

q = 1/3

an = a1 * q^n - 1

2 = 4374 * (1/3)^n - 1

2 / 4374 = (1/3)^n - 1

1 / 2187 = (1/3)^n - 1

(1/3)^7 = (1/3)^n - 1

n - 1 = 7

n = 7 + 1

n = 8

PG = { 4374 , 1458 , 486 , 162 , 54 , 18 , 6 , 2 }