4. The first term of a geometric series is 5 and the common ratio is 1.2
For this series find, to 1 decimal place,
- the \(20 ^ { \text {th } }\) term,
- the sum of the first 20 terms.
The sum of the first \(n\) terms of the series is greater than 3000
- Calculate the smallest possible value of \(n\).