Question

encontre a razão da PG (1; 3; 9; 27; 81..)?

Answer 1

$\\ r = \frac{ a_{2} }{ a_{1} } = \frac{ a_{3} }{ a_{2} } ....= \frac{ a_{n} }{ a_{n-1} } \\ \\ r = \frac{ a_{2} }{ a_{1} } \\ \\ r = \frac{3}{1} \\ \\ r = 3$