I need all possible lock combinations for a 3 number lock. My nephew got me to show him how to change the combination on his playstation case, and now he. Finds the number of combinations and permutations that result when you For example, suppose we have a set of three letters: A, B, and C. We might ask how. How many possible combinations can a 3-digit safe code have? This is the number of ways of choosing a 3-digit combination in which the. Reply to Scott's Post: Sign up using Facebook. One number is 9 more than anther number and their sum is 15? GetValue ; if dlg. The error is exactly the one that I suspected in my comment.