Question

1-5的数字不重复排列组合有多少种

12345.12354.12453.12435.12543.12534.
13245.13254.13425.13452.13542.13524
14235.14253.14352.14325.14523.14532
15234.15243.15342.15324.15432.15423
21345.21354.21435.21453.21534.21543
23145.23154.23451.23415.23541.23514
24135.24153.24315.24351.24531.24513
25134.25143.25314.25341.25413.25431
31245.31254.31425.31452.31524.31542
32145.32154.32451.32415.32514.32541
34125.34152.34251.34215.34512.34521
35124.35142.35214.35241.35412.35421
41235.41253.41325.41352.41523.41532
42135.42153.42315.42351.42513.42531
43125.43152.43215.43251.43512.43521
45123.45132.45213.45231.45312.45321
51234.51243.51324.51342.51423.51432
52134.52143.52314.52341.52413.52431
53124.53142.53214.53241.53412.53421
54123.54132.54231.54213.54312.54321
回答问题没法复制这些个数字只能这样了。抱歉 ！

Answer 1

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