Question

Determine o número de termos da P.G (1,2,...,256).

Answer 1

Formula: an = a1.q^n-1

an = 256
a1 = 1
n = ?
q = 2


256 = 1.2^n-1
256/1 = 2^n-1
256 = 2^n-1
2^8 = 2^n-1
n - 1 = 8
n = 8 + 1
n = 9