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Find the sum of the first five terms of 2/3 + 8/9 + 26/27 + ...

 Feb 22, 2021
 #1
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-1

2/3 + 8/9 + 26/27 + 80/81 + 242/243

 

= 5(1) - (1/3 + 1/9 + 1/27 + 1/81 + 1/243)

 

 = 5 - 121/243

 

= 1094/243

 Feb 22, 2021

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