A nuclear power plant uses 3 cooling lines to carry away heat from the central core reactor. Line A cools the top surface while lines B1 and B2 cool the top and bottom halves of the cylindrical chamber. The reactor will not overheat if any one B lines is functioning along with A (i.e. one lB line is down) or if both B lines functions (i.e. A is down. If the reliability of each line is 0.95, what is the overall system reliability.
