#### Answer

(A∪B∪C)= {1,2,3,4,5,6,7,8,9,10,11,12}

#### Work Step by Step

The set (A∪B∪C), represents the all the elements of the set A and the set B which are not present in set A and the elements of set C which are not present in set A and B.
From the given Venn diagram we can conclude that the regions I, II, III, IV, V, VI, VII are belongs to the set (A∪B∪C). The element of these regions are 1,2,3,4,5,6,7,8,9,10,11,12.
So, (A∪B∪C)= {1,2,3,4,5,6,7,8,9,10,11,12}