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Yahoo!
 one year ago
Best ResponseYou've already chosen the best response.2\[an = \frac{ n(n+1)(2n+1) }{ 6 }\]

SithsAndGiggles
 one year ago
Best ResponseYou've already chosen the best response.0Do you see how the nth term is something like \[1^2+2^2+\cdots+(n1)^2+n^2?\] What's the sum of all square numbers from 1 to n? i.e., \[\sum_{k=1}^n k^2?\]
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