SOLUTION: what if R is equal to negative 1 and the N is odd number in geometric series.

Question 977535: what if R is equal to negative 1 and the N is odd number in geometric series.
Answer by Edwin McCravy(20086) (Show Source): You can put this solution on YOUR website!

Here are two examples of geometric series' with R=-1 and the number
of terms N is odd:

2,-2,2,-2,2,-2,2

The nth or 7th term, 2, is the same as the first term, 2.

Another example

-8,8,-8,8,-8

The nth or 5th term, -8, is the same as the first term, -8.

That'll always be the case.

Edwin