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Math Help - Geometric Progressions question help

  1. #1
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    Geometric Progressions question help

    A machine is required to have 5 speeds, lowest being 60 rev/min and the highest being 680 rev/min. state the complete range of speeds i) in AP and ii) in GP

    i have done the AP part, i am a little stuck with where to start with the GP part as i have the 1st and 5th terms of the sequence

    a starting pointer would be helpful if anyone could give me a pointer thanx
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  2. #2
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    If this is a geometric progression, then it is a=60, a\cdot q, a\cdot q^2, a\cdot q^3, a\cdot q^4=680 for some q. From here, you can find q.
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