Using summation notation to express the sum of a geometric series

👉 Learn how to write the sum from a geometric series. A series is the sum of the terms of a sequence. A geometric series is the sum of the terms of a geometric sequence. The formula for the sum of n terms of a geometric sequence is given by Sn = a[(r^n - 1)/(r - 1)], where a is the first term, n is the term number and r is the common ratio.

To write the sum we will either be given the series as a sum or written in sigma notation. Either way, we will need to determine the rule of the sum by identifying the common ratio and first term.

Organized Videos:
✅Series
✅Series | Learn About
✅Find the Sum of the Arithmetic Series
✅Find the Sum of the Geometric Series
✅Write the Rule of the Geometric Series
✅Find the Sum of a Series
✅Write the Rule of the Series

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[michaelappiagyei]

what happens if the two terms arent equal

[dionetee]

Thanks for the videos ... they clarify some confusions I have :) .. 

[HHstudios]

3:28
2*(-1/4)^2 comes out to be a positive 1/8
negative squared is always positive :D

[hughjassole]

thank you for the lesson hopefully you get more subscribers so you can start making some serious money off of youtube. good luck

[makaleighdonges]

why is r -1/2 shouldn't it be -1/4 or am i missing something