Posted by ALICIA on Tuesday, July 22, 2008 at 5:50pm.
Easier if you write it as
_AB
_CD+
____
AAA
The largest A+C can be is 18 (1 carried plus say A or C=9 and A or C=8) so A must =1 (it can't=0)
re-write
_1B
_CD+
____
111
In order for 1+C=11, C =9 with 1 carried from B+D.
We don't need to know what B and D are.
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