Determine whether each of these sets is countable or uncountable. For those that are countable, exhibit a one-to- one correspondence between the set of natural numbers and that set.
a. integers not divisible by 3
b. integers divisible by 5 but not by 7
c. the real numbers with decimal representations consisting of all 1 s
d. the real numbers with decimal representations of all Is or 9s
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