1000, 000, 2001}} 4. Let X be the set comprising all numbers of the following two types: • Natural numbers; • Natural number multiples of meaning 7, 27, 37, and so on. (To clarify, X includes numbers like 39 and numbers like 107.) Is X a countable set? If what is a one-to-one correspondence that shows it? If no, why not? yes, 1 MacBook Pro

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