Q: How many different ways can you set a 4 digit lock using numbers 1-9 code if you do not repeat a dig it?

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You can select 9 numbers for the first digit, 8 numbers for the second digit, and 7numbers for the third digit; so 504 (e.g. 9*8*7) different three digit numbers can be written using the digits 1 through 9.

Six, if you don't repeat any.

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

24 different numbers.

55----------------------------------------------------------------------------------------------From Rafaelrz.You can make, 5! = 120, five digit numbers using 1,2,3,4 and 6.

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If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.

6, if you don't repeat any numbers.

If you can repeat the numbers within the combination there are 10,000 different combinations. If you cannot repeat the numbers within the combination, there are 5040 different combinations.

Number of 7 digit combinations out of the 10 one-digit numbers = 120.

You can select 9 numbers for the first digit, 8 numbers for the second digit, and 7numbers for the third digit; so 504 (e.g. 9*8*7) different three digit numbers can be written using the digits 1 through 9.

Six, if you don't repeat any digits.

9999

Six, if you don't repeat any.

You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.

120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.

1,023.

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.