a robber want to rob the bank, but the bank have high security, the guards always will ask a pasword, the robber hide himself near the guards and try to find out what the pasword is, after long waiting, an employee of the bank comes to the guards and ask them if he can get in the building, the guard say: six then the employee say: three, after that another employee comes and ask if he can get in, the guard say: twelve then the employee say: six, the robber is sure that he know how it works and ask the guard if he can get in, the guard say: ten then the robber say: five, but then the guards arrest him. why was the number five wrong?? @puppysboy222 must i pm the answer?