# Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 7: 8

$A'=${$4;5$}

#### Work Step by Step

$A'$ means the complement set of A, which contains all elements that are in the universal, but not in set A. Here: $U=${$1;2;3;4;5$} $A=${$1;2;3$} Therefore: $A'=${$4;5$}

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