A | 44 |
②从四组(1,1),(2,2),(3,3),(4,4)中任取两组有
C | 24 |
C | 24 |
③从四组(1,1),(2,2),(3,3),(4,4)中任取一组有
C | 14 |
C | 23 |
A | 24 |
C | 14 |
C | 23 |
A | 24 |
C | 22 |
综上可知:用8个数字1,1,2,2,3,3,4,4可以组成不同的四位数个数是
A | 44 |
C | 24 |
C | 14 |
C | 23 |
A | 24 |
C | 22 |
故选C.
A | 44 |
C | 24 |
C | 24 |
C | 14 |
C | 23 |
A | 24 |
C | 14 |
C | 23 |
A | 24 |
C | 22 |
A | 44 |
C | 24 |
C | 14 |
C | 23 |
A | 24 |
C | 22 |