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Q: How many 4 digit codes are possible?
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How many possible 4 digit combinations are there using 0-9. how many different combination codes are possible?

There are 210 4 digit combinations and 5040 different 4 digit codes.


How many different 4-digit codes are possible if the last digit has to be zero?

There can be 103 = 1000 codes.


How many different 4-digit codes are possible if the digits cannot be repeated?

If you include 0000, ten thousand unique four digit codes are possible.


How many possible 4 digit 0 thru 9 codes?

If the first digit can be zero, there are 5,040. If the first digit can't be zero, there are only 4,536.


If a digital combination lock on a phone has 4 spaces with digits 0 to 9. How many 4 digit combination lock codes are possible?

104 or 10000


How many different codes of 4 digits are possible if the first digit must be 3 4 or 5 and if the code may not end in 0?

3x10x10x10x9=2700


What is the ten digit postal code for Maryland?

There are no ten digit zip codes. Maryland has many five digit zip codes and many many more nine digit zip+4 codes. There can be a unique nine digit zip+4 code for every mailbox in a post office building and for at least every block in a town or city!


If a digital combination lock on a phone has 4 spaces with digits 0 to 9 How many 4 digit combination lock codes are possible if any digit can be repeate?

I would have to say 10,000 possible combinations. (0000, 0001, 0002 through 9998, 9999)


How many 4-digit numbers are possible if the hundreds digit is 8 and if repetition of digits is allowed?

-4


How many 3 digit codes can be made from 1 2 3 4 5 without repeating a digit?

this is impossible


How many 6 digit license plate codes are possible without repeating any digits?

10!/(10-6)! =10!/4! = 10*9*8*7*6*5 = 151200 different codes


How many possible 5 digit combinations with 20 no?

4+4+4+4+4= 20