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Mathematical induction problem solving question help!

  1. Mar 26, 2012 #1
    hi this question i just cannot do. i have no idea where to start:

    a student is trying to recall the formula for the sum of cubes of consecutive numbers. she thinks it may be (n^3(n+1)^3) /8 or (n^2(n+1)^2)/4 . show by counter example one is incorrect and the other is correct by induction.

    i can do the induction part its just the counter example i dont know where to start! thanks you
  2. jcsd
  3. Mar 27, 2012 #2


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    Science Advisor

    Try different n's, at some point (n=2) they give different results.
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