2 FIGURE 98.3 Parallel model FIGURE 98.4 Parallel series model. Output FIGURE 98.5 Series-parallel mode Hence the system reliability will be r(t)=1-[1-r(t)]n (98.15) In practice, systems will be made up of differing combinations of parallel and series networks; the simplest examples are shown in Figs. 98.4 and 98.5 e 2000 by CRC Press LLC© 2000 by CRC Press LLC Hence the system reliability will be: rs (t) = 1 – [1 – r(t)]n (98.15) In practice, systems will be made up of differing combinations of parallel and series networks; the simplest examples are shown in Figs. 98.4 and 98.5. FIGURE 98.3 Parallel model. FIGURE 98.4 Parallel series model. FIGURE 98.5 Series-parallel model