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Official 2018 Paper 1 · Q2

Paper 1Sequences & series

An arithmetic progression has first term aa and common difference dd.

The sum of the first 5 terms is equal to the sum of the first 8 terms.

Which one of the following expresses the relationship between aa and dd?

Aa=−383da=-\frac{38}3d
Ba=−7da=-7d
Ca=−6da=-6d
Da=6da=6d
Ea=7da=7d
Fa=383da=\frac{38}3d

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