Probability
# Set Operations

Given the sets $A = \{2, 20, 22, 5, 13\}$ and $B = \{6, 9, 20, 12, 22\}$, what is the sum of all the elements in $A \cup B$?

You may first choose to read the summary page Set Notation.

Given the sets $A = \{17, 29, 65, 1, 19\}$ and $B = \{3, 9, 29, 101, 65\}$, what is the sum of all the elements in $A \cap B$?

**Details and assumptions**

You may first choose to read the summary page on Set Notation.

If $\begin{aligned} A &= \{x \mid x \text{ is any positive factor of } 52\} \\ B &= \{x \mid x \text{ is any positive factor of } 338\}, \end{aligned}$

what is $A \cap B?$