1,234
1,243
1,324
........
........
+4,321
The addition problem above shows four of the 24 different integers that can be formed by using each of the digits 1, 2, 3, and 4 exactly once in each integer. What is the sum of these 24 integers?
24,000
26,664
40,440
60,000
66,660
告诉了一共是24个数,说明以任何一个数作为千位的数会有6个。
登录 或 注册 后可以参加讨论