How many 6 digit different locker combinations are possible if no repeat numbers are allowed?

Since we are trying to find the number of sequences can be made without repetition, we are going to use a combination.

The formula for combinations is:

Since there are 10 total digits, in this scenario. Since we are choosing 6 digits of the 10 for our sequence, in this scenario. Thus, we are trying to find . This can be found as shown:

There are 210 total combinations.