# Chapter 10 Counting Methods and Probability - Extension - Apply Set Theory - Practice - Page 716: 1

$A\cup B=\{2, 3, 5, 7, 11, 13, 17, 1, 4, 9, 16\}$

#### Work Step by Step

The union of two sets is the set of elements that are in at least one of the two sets. Hence here $A\cup B=\{2, 3, 5, 7, 11, 13, 17, 1, 4, 9, 16\}$

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