A system has two subsystems designated A and B$.$ Subsystem B is a backup for

subsystem A$.$ Subsystem A has $3$ components which all need to function successfully

for the subsystem to operate. Subsystem B has $3$ components and at least $1$ of the $3$ must

function successfully for the subsystem to operate.

Table $2$ presents the estimated reliability band for each component over the system's

estimated $5-$year life interval.

$($i$)$ Draw the reliability block diagram $($use of EVENT TREE$)$ the for the system

Table $2$ Reliaility bands for the system