et SS be the universal set, where: S={1,2,3,...,18,19,20}S={1,2,3,...,18,19,20}

Question

et SS be the universal set, where:
S={1,2,3,...,18,19,20}S={1,2,3,...,18,19,20}
Let sets AA and BB be subsets of SS, where:

Set A={2,5,7,9,10,14,15,16,17}A={2,5,7,9,10,14,15,16,17}

Set B={3,4,5,7,8,10,11,12,13,18,20}B={3,4,5,7,8,10,11,12,13,18,20}

Find the following:

LIST the elements in the set (ABAB):
(AB)(AB) = {  }
Enter the elements as a list, separated by commas. If the result is the empty set, enter DNE

LIST the elements in the set (ABAB):
(AB)(AB) = {  }
Enter the elements as a list, separated by commas. If the result is the empty set, enter DNE

You may want to draw a Venn Diagram to help answer this question.

Explanation / Answer

(AB) means A or B , means the set will contain all the entries which are there in bot A and B but will not be repeated if they are in both.

(AB)= {2,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,20}

(AB) will contain those values which are common in both A and B, no other value will lie in this A intersection B.

(AB)= {5,7,10}

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