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6! = 6 x 5 x 4 x 3 x 2 x 1 = 6 x 5 x 4 x 3 x 2 x 1 = 6 x 5 x 4 = 120/6 = 20
3!(6-3)! 3! 3! 3 x 2 x 1 x 3 x 2 x 1 3 x 2 x 1
maka ada 20