The answers to exercise marked [BB] can be found in the Back of the Book.
Let X be the set of all countries in the British Commonwealth and Y be the set of all people who live in these countries.
(a) [BB] Show that Prime Minister: X → Y and Domicile: Y → X are functions.
(b) Show that Prime Minister is one-to-one but not onto.
(c) Show that Domicile is onto but not one-to-one.
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