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# arithmetic sequences watch

1. (Original post by Notnek)
For c) you need to consider the expression inside the sigma so for r = 1:

Try doing it for r = 2 and r = 3.
Haha no way they all equal 5 lol.
Does this mean the answer is 500?
2. (Original post by Notnek)
For c) you need to consider the expression inside the sigma so for r = 1:

Try doing it for r = 2 and r = 3.
No way they all equal 5 lol.
Does this mean the answers 500?
3. Sorry i'm new to the student room and sent it twice as i didn't realise it already sent.
4. (Original post by HiggsBoson)
Haha no way they all equal 5 lol.
Does this mean the answer is 500?
That’s correct

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Updated: March 12, 2018
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