What is the sum of the first 6 terms of this geometric sequence? 5, 10, 20, 40,
The sum of the first 6 terms of this geometric sequence 5,10,20,40 .... is 315. common ratio = 40/20 = 20/10 = 10/5 = 2 S6 = 5(1 - 2^6)/(1 - 2) = 5*(-63)/(-1) = 315
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Asked 4/4/2016 6:54:56 AM
Updated 4/6/2016 10:47:57 PM
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3
The sum of the first 6 terms of this geometric sequence 5,10,20,40 .... is 315.
common ratio = 40/20 = 20/10 = 10/5 = 2
S6 = 5(1 - 2^6)/(1 - 2) = 5*(-63)/(-1) = 315
Added 4/6/2016 10:47:57 PM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [4/7/2016 12:19:16 AM], Rated good by Andrew.

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Questions asked by the same visitor
What is the 8th term of this geometric sequence? 3, 6, 12, 24, …
Question
Updated 4/6/2016 10:50:47 PM
The 8th term of this geometric sequence 3,6,12,24 ..... is 384.
common ratio = 24/12 = 2,
8th term = 3*2^(8-1) = 3*2^7 = 3*128 = 384
Added 4/6/2016 10:50:47 PM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [4/7/2016 12:18:41 AM]
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