Familiarize yourself with the foundational notation, tools and concepts for the operations that are applied to sets.

What is

\[ ( A \backslash B ) \cup ( B \backslash A)? \]

If \[A=\{2,5,6,18,20\}, B=\{1,2,6,20,22\},\] then which of the following is equal to \(\left((A \setminus B) \cup (B \setminus A)\right) \cap A?\)

**Details and assumptions**

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The sets \[A=\{12,14,16\}, B=\{13,15,17\}\] are subsets of a universal set \(U\). If \(A \cup B=U,\) then what is the sum of the elements of the set \[\left((A \cap B) \cup (A^{C} \cap B)\right) \cup \left((A^{C} \cap B^{C}) \cup (A \cap B^{C})\right)?\]

**Details and assumptions**

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Suppose \(A\) and \(B\) are the following subsets of a universal set \(U\): \[A=\{1,3,5,10,13,23\}, B=\{2,4,6,14\}.\] What is the number of elements of the set \[A \setminus \left((A \setminus B) \cup \left(A \setminus B^{C}\right)\right)?\]

**Details and assumptions**

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