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Mathematical Induction question

  1. Oct 23, 2006 #1
    I need help getting started on using Mathematical Induction with this problem....
    so what should i do first?

    a + (a+d)+(a+2d)+...+[a+(n-1)d] = (n/2)[2a+(n-1)d]
  2. jcsd
  3. Oct 23, 2006 #2
    never mind...i found the answer
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