$2.$ Tool for Reliability Consider the following system with disks $1,2$ and $3.--10$ Disk $1$s with $1,000,000-$hour MTTF $--19$ Disk $2$s$,$ each with $450,000-$hour MTTF$.--1$ Disk $3$s with $700,000-$hour MTTF $--$ MTTR for single disk is $8000$ hours and $13,000$ hours for the system $--$ p$($disk$)$ is $1--$ G is $5$ Find the MTTF of the system.