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  3. 17 is the set r closed under division if your...

Question: 17 is the set r closed under division if your...

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17. Is the set R+ closed under division? If your answer is yes, provide two (2) typical examples of division of real numbers illustrating this; if your answer is no, provide one (1 showing the non-closure. 18. Is the set R- closed under division? If your answer is yes, provide two (2) typical examples of division of real numbers illustrating this; if your answer is no, provide one (1) counterexample showing the non-closure. 19. Is the set Q closed under the process of finding positive square roots? If your answer is yes, provide two (2) typical examples of positive square roots of positive rational numbers illustrating this; if your answer is no, provide one (1) counterexample showing the non-closure.
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