Answer:
Step-by-step explanation:
Given that a locker combination system uses three digits from 0 to 9.
Repitition is not allowed.
Three digits can start with 0 also.
Here since order matters, permutation should be used.
Hence 3 digits for lock without repitition from 10 digits can be done in 10P3 ways
=10*9*8
=720
There are 720 different combinations
