> 9999876
Actually, 9999876 has four different digits (6, 7, 8, 9). The largest 7-digit number with three different digits is 9999987.
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Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
123
36
There are 126 different 5 digit combinations. Note that the combination 12345 is the same as the combination 45312.
8765 and 8756 and 8675 There are 24 total.