Question

Qual o termo da PG(729,2430,8100...)é igual a 1.000.000

Answer 1

an = 1000 000 

n= ? 

q = 2430/729 

q = 10/3 

an = a1 x q^(n - 1) 

1000.000 = 729 x 10/3^(n - 1) 

10/3^(n - 1) = 1000.000/729 

10/3^(n - 1) = (10/3)^6 

n - 1 = 6 

n = 6 + 1 

n = 7 

O sétimo termo.