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Find sequence formula

  1. Apr 15, 2008 #1
    I have to find a formula for the general term of An for this sequence assuming that the pattern follows and continues. (13,3,13,3...)
    I don't think theres any straightforward formulas to use for sequences and series' in finding a formula.
    My attempt involved finding two numbers that add to 13 and subtract to 3 which is 8 and 5, but what I'm stuck on is inserting the n variable so that the pattern will keep repeating 13,3,13,3..so on. Totally lost on how to do it and it doesn't even seem that hard.
  2. jcsd
  3. Apr 15, 2008 #2
    Try A_n = 8 + 5*(-1)^(n+1).
  4. Apr 15, 2008 #3
    figured it out thanks for the tip
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