1234能组成多少个数字

Question

如题所述

Answer 1

用1234这四个数字能组成24个不重复的两位数
12.34
12.43
13.24
13.42
14.23
14.32
21.34
21.43
23.41
23.14
24.13
24.31
31.24
31.42
32.14
32.41
34.12
34.21
41.23
41.32
42.31
42.13
43.12
43.21