This week I learned about Finite geometric series, I learned how to find and I also learned how to find the sum of to .

To find you need and the common ratio.

So say I was trying to find , so =4 and the common ratio is 3. This is what you would do.

Then to find the sum of all the 15 t’s, you would add + + +…etc. But the easier way to do it would be to do this.