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回覆 袁文文 的帖子
2 determining factors:
1. C must be even ==> C could be 0,2,4,6,8
2. 3C+2D must be divisible by 3 ==> D could be 0,3,6,9
And C & D are not identical, total of such numbers = 3+4+4+3+4=18
The biggest of which is 389898.
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