6 options for the first digit, 5 options (any of the remaining digits in each case) for the second digit, 4 options for the third digit, etc.: 6 x 5 x 4 x 3 x 2, which can also be written as 6! (6 factorial).
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if its not alphanumeric, 999999 variations
Too many to list here-see below.
It depends on whether the order of the numbers is important or not. For example, if 123456 is seen as a different code to 213456 then there are many more possible solutions.If the order is unimportant, the number of possible combinations is equal tobinomial coefficient(15,6) = 5005If the order is important, then the number of possible permutations is equal to15! = ~1.3x1012
theres only 1 number which is 123456, the least digit is 1 and the greatest is 6
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