The answer is 6! which is 6*5*4*3*2*1 = 720. Think of it as the first number you have 6 choices, the next number you have 5 choices, the next number you have 4 choices and so forth.
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6 possible 3 digit combonations
umm i think there would be 3 combonations. correct this if you think this is wrong. 00, 11, 22,
There are really only three main counting systems: roman numerals, tallys, and Arabic numbers. Arabic numbers are the simplest to make large number combonations.
About 13million,
262