Question

Sabendo que numa PG a1=15, an=3645 e n= 6, encontre a razão.​

Answer 1

$a_n=a_1.q^{n-1}$

$3645=15.q^{6-1}$

$15.q^5=3645$

$q^5=\frac{3645}{15}$

$q^5=243$

$q=\sqrt[5]{243}$

$q=3$