Question: . Determine whether each of these sets is countable or uncountable. For those that are countably infinite, exhibit a one-to-one correspondence between the set of

. Determine whether each of these sets is countable or uncountable. For those that are countably infinite, exhibit a one-to-one correspondence between the set of positive integers and that set.

integers not divisible by 3

integers divisible by 5 but not by 7

the real numbers with decimal representations consisting of all 1s

the real numbers with decimal representations of all 1s or 9s

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