ndary of a path-connected set in R^2 with the usual

The booking limits for four fare classes in a flight are given as b = (b₁,b2, b3, b4) = (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}? [ Select] (b) From this available capacity, how many seats are protected for class 1, i.e., what is the protection level for class 1? 15

Consider the relation on A = {a, b, c, d, e} given by R = {(a,b), (b,c),(b,d), (b,e),(d,e)}