Reiny or Damon or Bobpursley
posted by Tabby .
Express the series 11 + 18 + 27 +...+ 171 using sigma notation.
Usually you would take 2718 and that's the step between numbers, right? (I think its the kvalue?) But 2718=9 and 1811=7. Are we stepping by k+2 here? Like k, k+2 k+4, k+6...?
Please help me. I'm not confident in sigma notation, and this question is difficult for me. Reiny, Damon, and Bobpursley have all given me good feedback before, but any tutor is welcome to respond to this!
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