Hello!
Notice that we have a series and we have to write it using sigma notation.
Let's analyze it:
• It starts with just the number 9, then a fraction is added and from there the exponents appear in crescent order.
Knowing it, we can write it as:
If we solve it, we will obtain:
![9+3+1+(1)/(3)+(1)/(9)+(1)/(27)=(364)/(27)](https://img.qammunity.org/2023/formulas/mathematics/high-school/68wr1whti01zvud26j0o8i3zxypncfuy7d.png)
Final answer: 364/27.