用数字0,1,2,3,4,5可以组成多少个没有重复的四位偶数,用排列组合解
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1024,1034,1054,1032,1042,1052,1204,1234,1254,1302,1342,1352,1402,1432,1452,1230,1250,1240,1320,1340,1350,1530,1540,2130,2150,2350,2530,2540,2430,2450,2410,
2140,,1502,1532,1542,2014,2034,2054,2104,2134,2154,2304,2354,2504,2534,3012,3014,3054,3102,3104,3142,3152,3124,3154,3120,3150,3140
3210,3240,3250,3214,3254,3420,3410,3450,3510,3512,3514,3520,3524,3504,3502,
4012,4032,4052,4102,4130,4132,4150,4152,4310,4312,4350,4352,4502,4532,4512,4510, 4530
4520,5012,5014,5032,5034,5102,5104,5130,5134,5302,5304,5310,5312,5342,5410,5412,
5430,5432
2140,,1502,1532,1542,2014,2034,2054,2104,2134,2154,2304,2354,2504,2534,3012,3014,3054,3102,3104,3142,3152,3124,3154,3120,3150,3140
3210,3240,3250,3214,3254,3420,3410,3450,3510,3512,3514,3520,3524,3504,3502,
4012,4032,4052,4102,4130,4132,4150,4152,4310,4312,4350,4352,4502,4532,4512,4510, 4530
4520,5012,5014,5032,5034,5102,5104,5130,5134,5302,5304,5310,5312,5342,5410,5412,
5430,5432
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