Might be an easier way 0,1,2,3,4,5,6,7,8,9 - total of 10 digits _ _ _ three places to fill can leave 100 and 1000 b/c both are even 1st place any digit except 0 and 5 - 8 choices 2nd place any digit except 5 - 9 choices 3rd place any digit except and even - only 4 choices ( 1,3,7,9) 8*9*4 = 288