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posted by Anonymous Thursday, December 27, 2012 at 11:27am.
prove that mean of cubes of first n natural numbers is [n(n+1)(n+1)]/4
by induction, you can show that n ∑ k^3 = n^2 * (n+1)^2 / 4 k=1 now divide by n, and you're done.
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