how do i solve part b and c?

Consider the following system 077077 Determine the probability that the system will operate under cach of these conditions a. The system as shown. (Do not round your intermediote calculotions, Round your final answer to 4 decimal places.) Answer is complete and correct. b. Each system component has a backup wish a probability of 77 and a switch that is 100 percent reliable. (Do not round your intermediate calculations. Round your finel enswer to 4 decimel ploces.) C Answer is complete but not entirely correct. c. Each system component has a backup with o probabaly of 77 and a swich that is 98 percent reliable. (Do not round your Intermediate colculations. Round your final answer to 4 decimal places.)