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September 20, 2014

September 20, 2014

Posted by **Anonymous** on Thursday, December 27, 2012 at 11:27am.

mean of cubes of first n natural numbers is [n(n+1)(n+1)]/4

- airthmetic progression -
**Steve**, Thursday, December 27, 2012 at 12:02pmby 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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