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Given that k=1 to n k 3 = n 2 (n+1) 2 /4, evaluate j=2 to n (j-1) 3 by the change of summation index

Given that _{k=1 to n} k³ = n²(n+1)²/4, evaluate _{j=2 to n} (j-1)³ by the change of summation index k = j-1.

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