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    • Thread Starter
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    Hi,

    I have been stuck on question 15, part (ii) on page 6 from the following link.

    http://intranet.cramlingtonlv.co.uk/...ercise%207.pdf

    Answers to part (i) were r=0.8 and a=2

    Any help would be appreciated.

    Thanks,
    • Study Helper
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    (Original post by KanKan)
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    Write out the first few terms, in terms of your original a, and r, and you should see what the new initial term and ratio are.
    • Thread Starter
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    Thank you very much, Previously I attempted (2 × 0.8^n-1)^2 but now it makes more sense to just to 2^2 and 0.8^2 and it worked

    Thanks again

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