$($a$)$ Find makespan, idle time for machines and waiting time of jobs if $($a$)$ each job first goes to machine $1,$ and then $2$; $($b$)$ job may go to either machine without any specific order.

$8$

$\backslash$table$[[$Job number,A$,$B$,$C$,$D$,$E$,$F$],[$Processing time on Machine $1,9,5,7,3,4,8],[$Processing time on Machine $2,3,7,4,5,8,9]]$