Question

numa PG temos A1=5 e A4=135.Determine a razão

Answer 1

$a1=5$
$a4=135$
$q(razao)?$

$a4 = a1.q ^{3}$
$135 = 5.q ^{3}$
$q^{3} = 135/5$
$q^{3} = 27$
$q} = \sqrt[3]{27}$
$q=3$