999,998
7542
88888888
7314
6*6*3 = 108 numbers.
9650 is the largest formed by re-ordering the digits.
How about 256
Try 130. Or how about 310.
Assuming the question refers to the digits 1, 2, ... , 9 the answer is 1344 numbers.
9998
985
501396
5214, 4512, 2154, 2514 etc.