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Let S1 = sum(k=1)^n K, S2 = sum(k=1)^n K...

Let `S_1 = sum_(k=1)^n K, S_2 = sum_(k=1)^n K^2 \ and \ S_3 = sum_(k=1)^n K^3`, then `(S_1^4 S_2^2 - S_2^2 S_3^2)/(S_1^2+S_3^2)` is equal to

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