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What is the sum of the infinite geometric series?

120+40+40/3+40/9+...

 

a.136

b.156

c.180

d.184

 Feb 16, 2021
 #1
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This website explains a part of this --> https://www.quora.com/What-is-1-3-1-9-1-27-1-81-1-243

 

This means the value of 40/3 + 40/9 +... = 40/2, which equals 20. 

 

This means your answer is 120 + 40 + 20, which gives you the answer of 180 :)

 Feb 16, 2021

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