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Set Theory :Complements with Ellipses

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Let U= {1,2,3, . . .},

A= {1, 2, 3, . . . ., 39}.

use the roster method to write the set A'

Find A' =
I understand how complements work. Complement A' is everything outside of set A. However, since U goes on infinitely with its ellipsis, how do I know exactly what the complement of A' is?

Help, please?

  • Set Theory :Complements with Ellipses - ,

    simple: A' = {40,41, ...}

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