# What is the sum of a 7–term geometric series if the first term is –11, the last term is –171,875, and the common ratio is –5?

The general term of a geometric series can be described by the formula:

Then we find:

So:

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The sum of the 7-term geometric series is -234,375.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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