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Homework Help: Arithmetic Series help

  1. Jan 3, 2007 #1
    Please could someone tell me the way to find the smallest positive term of an arithmetic series (C1 level) as I cannot find a formula anywhere.

    Thank you.

    Cathy
     
  2. jcsd
  3. Jan 3, 2007 #2

    cristo

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    You could rearrange the formula [tex] S_n=\frac{n[2a_1+(n-1)d]}{2} [/tex], where n is the numbers of terms, Sn is the sum of the first n terms, d is the difference between the ith and (i+1)th term, and a1 is the first term of the series.
     
  4. Jan 3, 2007 #3
    Okay. Thanks for your help.

    Cathy
     
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