Question

Answer the following
In G.P., 2, -6, 18, -54,..... find $a_n$

Answer 1

Consider the given G.P. series.

$2,-6,18,-54,.....$

Here, $a_1=2,r=-3$

We know that the $n^{th}$ term of $G.P.$

$=a_1{r}^{n-1}$

Therefore,

$=2\times (-3{)}^{n-1}$

Hence, this is the answer.