Please help! What is the sum of the series? 20 on top and n-1 on the bottom of ∑(5-n)

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Please help! What is the sum of the series? 20 on top and n-1 on the bottom of ∑(5-n)

Mathematics
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did you mean n=1?
no it's a n-1 on the bottom of the sigma.

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\[\sum_{n-1}^{20} (5-n)\]
yes exactly like that
It should be n=1 I am certain. If we did this "manually" we would have 4 + 3 + 2 + ... Right?
alright..
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?
I think I got the answer. -110
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.
thank you! :)
You are welcome. All done? Thanks for the medal.
Well I do have a couple more questions, but I'm gonna post them separate to this post.
Of course.

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