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Math Help - Solving this sequence problem?

  1. #1
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    Exclamation Solving this sequence problem?

    Calculate the sum between the terms t5 and t9 of the geometric sequence in which the 4th term is -9/8 and the 7th term is 8/3. I find it confusing since I don't know which terms to find the terms for. Is it S9-S5 or is the sum only for the terms 6,7 and 8?
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  2. #2
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    Re: Solving this sequence problem?

    Hey Neil123.

    S_9 - S_5 should include the 6th, 7th, 8th, and 9th terms (assuming the first term is S_1, otherwise it will be 10th, 9th, 8th, and 7th terms).
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