What is the ending to fallout 3

The ending of Fallout 3 can be done in many different ways. There are at least 3 ways of ending the game. One, you can go to project purity and put in 2-1-6 on the control panel, and you will die when this happens since the radiation there can kill you. After you die the credits will roll in. Second, you can ask someone else to go in there for you and you don't have to die, either way the credits will roll in after the code has been put in by anyone or yourself. Third, you can be the bad guy and destroy Project Purity by installing some kind of device that President Eden gave you. Either way, the credits will roll in by which ever method you chose of ending the game.