You should try out all of the three-digit combination.
There are 10x10x10 = 1,000 possible combination (assuming digits 0-10).
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Allowing repetitions, there are 9 combinations. Without repeated digits, there is only one combination of 3 digits from 3.
The sixth digit of the NAICS code is used to define national industries
check digit
Digit Check
the answer is 1010 the 1st digit is 1 x 8 = 8 the 2nd digit is 0 x 4 = 0 the 3rd digit is 1 x 2 = 2 the 4th digit is 0x 1 =0 i hope this helps