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QUESTION
(5) Let A be a set, and let f : A gt; 2'4 be a function. Let B = {as e A : f (33)} Show that B I m( f). As a consequence, f is not onto.
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(5) Let A be a set, and let f : A —> 2‘4 be a function. Let B = {as e A : :1: ¢f (33)} Show that B ¢ I m( f). As a consequence, f is not onto.