# Homework Help: Probability question

1. Jan 7, 2009

### kasse

The numbers represent the probability that each component works.

a) What's the probability that the entire system works?
b) Given that the system works, what's the probability that the component A is not working?

a) P=.75112, easy
b) Don't know what to do here....

2. Jan 7, 2009

If you were asking this: Given the system works, what is the probability $$1$$
* $$3, 4$$ and $$5$$ are all operating
* $$1$$ is not operating, status of $$2$$ is unimportant