The article deals with methodology of a system failure rate calculation that is based on the adoption of the condition l. t<<1. Assuming that the condition is satisfied. the serial-parallel system failure rate calculation is easier and the results are either the same or worse from a view of system reliability evaluation. https://www.diegojavierfares.com/top-super-Geometric-Green-and-Blue-Square-Tablecloth-amazing-save/