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If (1^(2)-a(1))+(2^(2)-a(2))+(3^(2)-a(3)...

If `(1^(2)-a_(1))+(2^(2)-a_(2))+(3^(2)-a_(3))+…..+(n^(2)-a_(n))=(1)/(3)n(n^(2)-1)`, then the value of `a_(7)` is

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