text: how many combinatoin possibility are there on a three combo lock? it is 4 my math homework if there are three combinations and each can go from 0 to 9, there are ten possibilities. so you have 10 choices for the first number. for each of these, you have 10 choices for the second number, so there are 10*10=100 choices. for each of these, there are 10 separate choices for the third number, so there are 100*10=1000 choices.