Worked example: finite geometric series (sigma notation) | High School Math | Khan Academy

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Sal evaluates the geometric series Σ2(3ᵏ) for k=0 to 99 using the finite geometric series formula a(1-rⁿ)/(1-r).

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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Комментарии
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I just have one question: Isn't the R value greater than 1, therefore it should be r^n - 1 right?

LordTechPro
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you never actually derived the Sn = a(1-r^n)/(1-r) formula at any point in your vids.  or did i miss it.  I have been going in progression on your website.

JuliusSP
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Could y'all do this and the other stuff about AGPs too ?

akashdikpati
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Why?
Not play on khan academy app in Indian curriculum

maaatif
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I have a problem I cannot seem to solve. I am given 3 partial sums S3 = (-49/8), S4 = (-105/16), and S5 = (-217/32) and asked to determine the common ratio. Can you please help? I've tried to use a system of equations from the summation formula but cannot seem to make it work.

landonschannel