Answer
a) $R^(-1) $= {(b,a) | a divide b} or {(a,b)| b divide a}
b) $\bar{R}$ = {(a,b) | a doesn't divide b}
Work Step by Step
For the first part, it is asking for the inverse relation. So, since R is a relation from A to B, then the inverse relation is the relation from B to A. It can be denoted as the inverse relation of R : {(b,a) | (a,b) $\in$ R} .
For the second part, it is asking for the complementary relation, which is the set of all the ordered pair not in R, which is all pairs that a doesn't divide b.
