Question

Determinar o numero de termos na P.G (5,10,20, ... , 2560)

Answer 1

Oi Laura

PG

u1 = 5
u2 = 10

q = u2/u1 = 10/5 = 2

termo geral
un = u1*q^(n - 1)

5*2^(n - 1) = 2560

2^(n - 1) = 512 = 2^9 

n - 1 = 9 

n = 10 termos