a 1 in the hundred place: 9*9 (9 options for 10 and 1 place)
a 1 in the tens place: 8*9 (8 options for 100 and 9 optinos for 1 place)
a 1 in the ones place: 8*9 (8 options for 100 and 9 optinos for 1 place)
9*9+8*9+8*9=225
I hope this helped. :)))
=^._.^=
+321 
