An infinite geometric series has common ratio $-1/2$ and sum 45.  What is the first term of the series?
Question:
An infinite geometric series has common ratio $-1/2$ and sum 45.  What is the first term of the series?
Answer:
Let's think step by step.

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\frac{135}{2}
An infinite geometric series has common ratio $-1/2$ and sum 45.  What is the first term of the series?
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