Answer
$A'=\{ Feb, April, June, Sep, Nov \}$
Work Step by Step
$A=\{Jan, March, May, July, August, October, December\}$
The elements in set U that are not in set A are "Feb, April, June, Sep, Nov"
$A'=\{ Feb, April, June, Sep, Nov \}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.