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infinitemoes
Group Title
Please help! What is the sum of the series? 20 on top and n1 on the bottom of ∑(5n)
 one year ago
 one year ago
infinitemoes Group Title
Please help! What is the sum of the series? 20 on top and n1 on the bottom of ∑(5n)
 one year ago
 one year ago

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Dido525 Group TitleBest ResponseYou've already chosen the best response.0
did you mean n=1?
 one year ago

Dido525 Group TitleBest ResponseYou've already chosen the best response.0
@infinitemoes
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
no it's a n1 on the bottom of the sigma.
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
\[\sum_{n1}^{20} (5n)\]
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
yes exactly like that
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
It should be n=1 I am certain. If we did this "manually" we would have 4 + 3 + 2 + ... Right?
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
alright..
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
This is an arithmetic sequence b/c we are adding 1 over and over. There is a formula to solve this, Arithmetic Series Formula. Do you know it?
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
I think I got the answer. 110
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
Let's see. The formula says: 1/2 the number of items times (first term + last term) 1/2 (20) (4 + 15) 10 (11) Good job.
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
thank you! :)
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
You are welcome. All done? Thanks for the medal.
 one year ago

infinitemoes Group TitleBest ResponseYou've already chosen the best response.1
Well I do have a couple more questions, but I'm gonna post them separate to this post.
 one year ago

mrbarry Group TitleBest ResponseYou've already chosen the best response.1
Of course.
 one year ago
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