Answer:
50440/729
Step-by-step explanation:
The sum of the first n terms of the geometric series is calculated as:
Where a is the initial term and r is the ratio.
To find the ratio, we need to divide the second term by the first one as follows
Therefore, replacing a by 120, r by -2/3, and n by 8, we get:
Then, the answer is 50440/729