Question: QUESTION 16 5.00000 points Determine whether set S is countable or uncountable. S is the set of the real numbers with decimal representations of all

QUESTION 16 5.00000 points Determine whether set S is countable or uncountable. S is the set of the real numbers with decimal representations of all 1s or 9s. If it is countable, exhibit a one-to-one correspondence between the set S and the set of positive integers. Briefly explain Paragraph Arial o Mashups Words Path 5.00000 points QUESTION 17 Prove that If A and B are countable sets, then A U B is also countable. Paragraph Arial (12pt) words.] Path: 5.00000 points QUESTION 18 Show that the set of positive rational numbers is countable. Paragraph Arial 3 (12pt)

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