Chapter 9.1, Problem 42E

R₁andR₂be the divides” and ‘is a multiple of relations on the set of all positive integers, respectively. That is,R₁={(a,b) |adividesb) andR₂={(a,b)| ais a multiple ofb). Find

a) $R_1\cup R_2$.

b) $R_1\cap R_2$.

c) $R_1-R_2$.

d) $R_2-R_1$.

e) $R_1\oplus R_2$.