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Math Help - Use sigma notation to write the sum

  1. #1
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    Use sigma notation to write the sum

    (x^4/8) - (x^5/9) + (x^6/10) - (x^7/11) + (x^8/12)
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  2. #2
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    Usualy when you want to write a sum that way you look for a rule...
    or .
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    or .
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