Answer
(AUB)'= {12,13}
Work Step by Step
The set (AUB)', represents the all the elements of the universal set U which are not present in AUB
From the given Venn diagram we can conclude that the regions VII and VIII are not represent the set (AUB).
So the regions VII and VIII belongs to (AUB)'. The element of these regions are 12,13
So, (AUB)'= {12,13}