Question

Quantos termos tem a PG 3,6,12, ..., 192 ????

Answer 1

Resposta:

7 termos

Explicação passo a passo:

$a_1=3\\q=\frac{6}{3}=2\\\\a_1.q^n^-^1=a_n \\\\3.2^n^-^1=192\\\\2^n^-^1=\frac{192}{3} \\\\2^n^-^1=64\\\\2^n^-^1=2^6\\\\n-1=6\\\\n=6+1\\\\n= 7$