Question

Qual o décimo termo da PG (1,2,4...)?

Answer 1

A 10 + ?
P.G.(1,2,4,...)
q = a 2 / a 1
q = 2 / 1
q = 2
a 10 = a 1 . q^n - 1
a 10 = 1 . 2 ^10 - 1
a 10 = 1 . 2^9
a 10 = 1 . 512
a 10 = 512

Answer 2

Qual o décimo termo da PG (1,2,4...)?

an = a1.q^(n-1)

a1=1
q= 2/1 = 2
n= 10

a10 = 1.2^(10-1) ==> a10 = 1.2^9 ==> a10 = 2^9 ==> a10 = 512