Question

Find the 10th term of a geometric sequence if $a_1=45$ and the common ratio $r=0.2$

Answer 1

General term of GP: $a_1{r}^{n-1}$

${10}^{th}$ term of GP $=a_1{r}^9=45(0.2{)}^9=23040\times {10}^{-9}=2.304\times {10}^{-5}$