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题库 / GMATAdvanced-PS-65
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
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一共24个数，每个数在每个位数出现6次，每个位数相加=1*6+2*6+3*6+4*6=60
再考虑分别处于个位、10位、百位、千位，和=60+600+6000+60000=66660
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