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1^2+2^2+3^2+ n^2 =...

`1^2+2^2+3^2+`___ `n^2 =`_______

A

`(n^2(n+1)^2(2n+1))/6`

B

`(n(n+1)(2n+1))/6`

C

`(n(n-1))/2`

D

None

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