Hypothetically speaking, if your death would save the life of one or more complete strangers that you know nothing about, how many people would need to be saved (if any) in order for you to give up your own life?
EDIT: Your death would be painless and instantaneous.
So is the question how many it would take for me to believe that I should give my life, or how many before I’d actually have the willpower to choose to die?