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What is the nth term of:
1^2 + (1^2+2^2) + (1^2+2^2+3^2)+.....
 one year ago
 one year ago
What is the nth term of: 1^2 + (1^2+2^2) + (1^2+2^2+3^2)+.....
 one year ago
 one year ago

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

SithsAndGigglesBest ResponseYou've already chosen the best response.0
Do 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., \[\sum_{k=1}^n k^2?\]
 one year ago
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