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# Edexcel C1 arithmetic series watch

1. Hello,

How would you do part (d)?
Also please could you show me the steps as well to how you got this answer?

Thank you
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2. (Original post by Shanahey)
Hello,

How would you do part (d)?
Also please could you show me the steps as well to how you got this answer?

Thank you
By using the equation from part c, substitute n of 196 and you get your sum of 196 terms .
I got 96138 is it correct? and tell me the paper year please.
3. Find the first and last terms

Use Sn = n/2(a+l)

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4. (Original post by brother aldi)
Find the first and last terms

Use Sn = n/2(a+l)

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Using that formula i got 100058, :/ what did i do wrong sheeet. :O
5. Ok i got it i was using a as 3 not 23
Thanks.

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Updated: May 11, 2015
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