Start counting from 0 to 9. Stop when you reach the number 1.
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9
There are no 3 digit numbers between 0 and 9 because 0 and 9 are 1 digit numbers.
(9/9)*1^6
im pretty sure that's impossibleAnswer:Since numbers starting with 0 are not counted as being 4 digits there are only 9000 possible combinations. All of them would follow the format "nmqr" (where n= 1->9), m=0->9), q=0->9, and r=0->9)
There are 9*9*8*7 = 4536 such numbers.