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There is only one possible combination of a 13 digit number created from 13 digits.
In a combination, the order of the digits does not matter so that 123 is the same as 132 or 312 etc.
If there are 13 different digits (characters) there is
1 combination of 13 digits
13 combinations of 1 or of 12 digits
78 combinations of 2 or of 11 digits and so on
There are 213 - 1 = 8191 in all.
If the characters are not all different it is necessary to have more information.
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How many possible combinations of a 7-digit number?
If the same 7 digits are used for all the combinations then n! = 7! = 7*6*5*4*3*2*1 = 5040 combinations There are 9,999,999-1,000,000+1=9,000,000 7-digit numbers.
What are the possible combinations for a 4 digit code?
Too many to list here-see below.
How many different combinations are possible using a 6 digit code?
if its not alphanumeric, 999999 variations
How many four digit combinations can be made from the number nine example 1 2 3 39?
How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
How many 3 number combinations are possible with 1234?
Just 4: 123, 124, 134 and 234. The order of the numbers does not matter with combinations. If it does, then they are permutations, not combinations.
