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An infinite geometric series has common ratio 1/8 and sum 80. What is the first term of the series?

 
 Jan 8, 2021
 #1
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$\frac{a}{1-r} = 80$

$\frac{a}{7/8} = 80$

$a = 70$

 
 Jan 8, 2021
 #2
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Please don't repost. The original answer is here https://web2.0calc.com/questions/geometric-series_21

 
 Jan 8, 2021

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