A missile complex has four subsystems: the radars, the missile, the computer control devices, and the human operators. Four radars are provided, of which three are required for successful operation. The complex has only a single missile. There are three computers operating and a successful operation requires any two of the computers working at the same time. There are two human operators, one of whom must be capable of firing the missile. Compute the reliability of the system when the reliabilities of the various components are given below. Component Reliability Radar 0.90 Missile 0.678 Computer 0.98 Human 0.78