sum (sum (sum ((-1)^(k-j)(k!/(j!(k-j)!))j^n), j=0 to k), k=0 to 5), n=0 to 5sum (sum (sum ((-1)^(k-j)(k!/(j!(k-j)!))j^n), j=0 to k), k=0 to 5), n=0 to 5

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