Question

find the g.p whose 4th term is 1/18 and 7th term -1/486

Answer 1

$nth \: term \: of \: gp \: = a \times {r}^{n - 1}$
$4th \: term \: = a \times {r}^{3}$
$7th \: term = a \times {r}^{6}$
4th term = 1/18
7th term =-1/486
7th term ÷4th term =