The first one is certainly a geometric series,
What do you think about the third one?
BTW: the 4th answer is written in incorrect English!!!!!! The word "none" is a SINGULAR noun.
Hannah C.
asked • 05/06/21Geometric Series (Not a test question)
Which of the following power series is a geometric series?
| I chose this because it has a common ratio of 3x | 1 + 3x + 9x2 + 27x3 + 81x4 + … |
| 1 + x + 2x2 + 3x3 + 4x4 + … | |
| 1 + x + x2 - x3 + x4 + … | |
| None of these are a geometric series. |
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