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= 8!/(8-4)! 4! × 8!/(8-2)! 2! × 8!/(8-2)! 2! × 3!/(3-3)! 3!
= 8!/4! 4! × 8!/6! 2! × 8!/6! 2! × 3!/0! 3!
= 8.7.6.5.4!/4! 4.3.2.1 × 8.7.6!/6! 2.1 × 8.7.6!/6! 2.1 × 3!/3!
= 70 × 28 × 28 × 1
= 54.880