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(Mathematical problem) If the difference between the last three digits and the first three digits is 0, can this number be divisible by 7? 1 1, 13?
The difference between the number represented by the last three digits of a number and the number represented by the first three digits (decreasing greatly) can be divisible by 7, 1 1, 13, and this number can be divisible by 7, 1 1 3.

0 can be divisible by any number, so this number can be divisible by 7, 1 1, 13.