As a product of its prime factors: 2 * 2 * 5 * 5 = 100
1234
With 4 different numbers, 24.
12 numbers
0288
-1
There are 192.
256!
They are: 4*4 = 16
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-7
what is the greatest 4-digit number you can make with the digit 0,1,2,3, and 4
The numbers are 4 and 13