Draw your system as a Reliability Block Diagram (RBD) – series vs. parallel.
Reliability Evaluation of Engineering Systems: Concepts and Techniques , co-authored by Roy Billinton and Ronald N. Allan , is a foundational text in the field of reliability engineering. Since its first publication, the book has become a primary resource for engineers and students seeking to understand the probabilistic nature of system performance beyond traditional deterministic methods. Draw your system as a Reliability Block Diagram
Billinton’s solution can be summarized in one sentence: "Reliability is not a binary property (reliable/unreliable); it is a continuous, measurable, economic risk." it is a continuous