0.99 to what power is 0.5? etc. 0.99^x=0.5. I'm asking this because I'm curious if I'd do something everyday that has 1% chance of k*****g me(or doing whatever else), how many days should I do it to have 50% chance of survival? :D I know the solution is achieved with logarithms but I'm don't know how to change their base yet. Thanks in advance :)