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Penyelesaian:
U x U x U = -216
U^3 = -216
U = +- 6
Pembuktian:
U1 x U2 x U3 = -216
= 6 x -6 x 6
= -216
Maka U4 = -6,
karena polanya positif, negatif, positif, negatif dan seterusnya