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Casio 991es & Sigma Notation help, please.

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    I dont know how to use latex and i've only got a min so sorry about the formatting.
    that defines my series.
    Then I have
    Sigma (3(a_n)-5)


    When inputting this into the calculator, is there any way to specify the starting value? ie a_1?
  2. Offline

    What are you trying to calculate? If you have the series with starting value 3 where a_{n+1}=3a_n-5 then you can just put 3 into your calculator and use the Ans key in place of a_n to find a_{n+1}.
  3. Offline

    Its the sum of the series that I need to calulate. It was todays exam. But either way, it would be nice to know. Its just how to set the starting value of 3 instead of 1
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    Look here.


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Updated: May 22, 2009
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