Question: (a) Let f be a function from A to B and let S and T be subsets of B. Show that f_1(S U T) :

(a) Let f be a function from A to B and let S and T be subsets of B. Show that f_1(S U T) : f_1(3) U f'1(T)- (b) Give an example of two uncountable sets A and B such that A B is (i) finite, (ii) countably infinite, (iii) uncountable

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