# arithmetic sequencesWatch

Thread starter 9 months ago
#21
(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?
1
quote
Thread starter 9 months ago
#22
(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?
0
quote
Thread starter 9 months ago
#23
Sorry i'm new to the student room and sent it twice as i didn't realise it already sent.
0
quote
9 months ago
#24
(Original post by HiggsBoson)
Haha no way they all equal 5 lol.
Does this mean the answer is 500?
That’s correct
0
quote
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