A bike lock has a 4 digit combination. Each character can be any digit between 1-9. The only restriction is that all 4 characters cannot be the same. For example, 1111, 2222, 3333,.etc. How many combinations are possible?

Skip to content
# A bike lock has a 4 digit combination. Each character can be any digit between 1-9. The only

A bike lock has a 4 digit combination. Each character can be any digit between 1-9. The only restriction is that all 4 characters cannot be the same. For example, 1111, 2222, 3333,.etc. How many combinations are possible?