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# Stuck on an arithmetic series Q help please watch

1. http://www.examsolutions.net/a-level...2&solution=5.1 An+1 = 2an-c A3 = 12-3c Look at 5:25 of the video he does 2(12-3c)
2. (Original post by Chris195)
http://www.examsolutions.net/a-level...2&solution=5.1 An+1 = 2an-c A3 = 12-3c Look at 5:25 of the video he does 2(12-3c)
Any possibility that you could post the question
3. (Original post by Chris195)
Look at 5:25 of the video he does 2(12-3c).
And, he does it right.
And, he does it right.
I got the correct answer too? how so.
5. (Original post by Chris195)
I got the correct answer too? how so.
Do I know how you got the correct answer?

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