Posted by chantelle on Sunday, April 29, 2012 at 6:30am.
single digit : 2 --->1
double digit:
12---->1
20, 21, ... 29,---> 10
32, 42, 52, 62, 72, 82, 92 ---> 7
triple digit
102 , 112, 121, 122 --->4
see if I missed any, then add them up
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