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11-08-2019
Mathematics

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Another sigma notation question. Please check. Hopefully I did this one correctly!

Another sigma notation question Please check Hopefully I did this one correctly class=

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MathPhys MathPhys

11-08-2019

Answer:

Your answer is correct. The series is a geometric series with common ratio -1/4 and first term 40. So each term is:

an = 40 (-1/4)^(n−1)

So the sum of the first 10 terms is:

∑(n=1 to 10) [ 40 (-1/4)^(n−1) ]

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