Answer:
what.....
Step-by-step explanation:
The answer is (108) i hope it works
Answer:
Step-by-step explanation:
No esay but they just do
Answer:

Step-by-step explanation:
The sum you are trying to understand is this.

Remember that in general when you have a geometric series
you have that
and that equality is true as long as
.
Therefore here we have
and 
Therefore we can use the formula and
