106 or a million.
How do I read my six digit code for facebook
Assuming each "digit" actually has 10 different states, there are one million combinations possible in a six-digit combination lock. However, many combination lock designs actually have fewer than 10 different states per "digit", resulting in far fewer actual combinations on such locks.
There are 720 of them!
9!/6!, if the six different orders of any 3 digits are considered distinct combinations.
factorial six tat is 6*5*4*3*2*1=720 combinations
That depends on how many of the digits are repeated. If no digits are repeated, you have 9 choices for the first digit, 8 choices for the second, etc.; for a total of 9 x 8 x 7 x 6 x 5 x 4.
NAICS uses a six-digit code to identify particular industries, in contrast to the four-digit SIC code
Six combinations if you use each digit only once per combination: 157 175 517 571 715 and 751.