Hello,

i've been trying to solve the following problem. If i have a system that is composed by 3 machines and all of them are needed for the super system to work, which is the probability of the system failing if each machine has a failure probability of 0.1?

I've thought about adding all three, which would result in 0.1+0.1+0.1=0.3, but then i thought that if the probability of failure is 1, i would get 1+1+1=3, which goes against the concept of probability. Can someone help me?

Thnks in advance