All possible 4 digit combinations of the numbers 1234567890
Finding all 4 digit combinations of the digits 0 through 9 is pretty straight forward.
You have a choice of 10 digits for each of the 4 places, so that means there are:
 10 x 10 x 10 x 10 = 10,000 possible combinations
We don't have the space to list them all, but we can show you the sequence, and how it progresses:
 0000 0001 0002 0003 0004 0005 0006 0007 0008 0009
0010 0011 0012 0013 0014 0015 0016 0017 0018 0019
0020 0021 0022 0023 0024 0025 0026 0027 0028 0029
This would continue on to the final sequence:
 9990 9991 9992 9993 9994 9995 9996 9997 9998 9999
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