Reliability of systems can often be improved with redundancy of critical components. Airplanes have two independent electrical systems, and typically two separate radios. If one component has a 0.001...

Reliability of systems can often be improved with redundancy of critical components. Airplanes have two independent electrical systems, and typically two separate radios. If one component has a 0.001 probability of failure, the probability of the two independent components both failing is only 0.000001 using the multiplication rule. Discuss where else redundancy like this is important.