用数字12360组成一个没有重复数字的四位数能组成多少个?
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解;用数字1,2,3,6,0组成没有重复数字的四位数有;1023,1026,1032,1036,1062,1063,1203,1206,1230,1236,1260,1263,1302,1306,1320,1326,1360,1362,1602,1603,1620,1623,1630,1632,2013,2016,2031,2036,2061,2063,2103,2106,2130,2136,2160,2163,2301,2306,2310,2316,2360,2361,2601,2603,2610,2613,2630,2631,3012,3016,3021,3026,3061,3062,3102,3106,3120,3126,3160,3162,3201,3206,3210,3216,3260,3261,3601,3602,3610,3612,3620,3621,6012,6013,6021,6023,6031,6032,6102,6103,6120,6123,6130,6132,6201,6203,6210,6213,6230,6231,6301,6302,6310,6312,6320,6321,共96个。
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4 × 4 × 3 × 2 = 96(个)
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