Question $6$

$1$ pts

The booking limits for four fare classes in a flight are given as $b=(b_1,b_2,b_3,b_4)=(15,10,5,2).$

$($a$)$ What is the available capacity for these four classes, i$.$e$.,$ what is the booking limit for classes $\{1,2,3,4\}?$

$($b$)$ From this available capacity, how many seats are protected for class $1,$ i$.$e$.,$ what is the protection level for class $1?$