SOLUTION: Whats an example of a geometric series where r = ½ and n = 4?

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Question 1041454: Whats an example of a geometric series where r = ½ and n = 4?
Found 2 solutions by robertb, ikleyn:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let the first term be 2.
Then the first four terms are 2, 1, 1/2, 1/4.

Let the first term be -3.
Then the first four terms are -3/2, -3/4, -3/8, -3/16.

And you can give a lot more examples...

Answer by ikleyn(52800) About Me  (Show Source):
You can put this solution on YOUR website!
.
On geometric progressions read the lessons
    - Geometric progressions
    - The proofs of the formulas for geometric progressions
    - Problems on geometric progressions
in this site.