There are three sets:
A = { 1, 2, 3, 4 }
B = { 3, 5, 6, 7 }
C = { 1, 3, 7, 8 }
Find:
(A⋃ B)⋂ C
I like doing these problems step by step.
Lets first find the elements of $\displaystyle A \cup B $
$\displaystyle A \cup B = {1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7}$
Now let's find the elements which appear in both $\displaystyle (A \cup B) $ and $\displaystyle C $
$\displaystyle (A \cup B) \cap C = {1 ; 3 ; 7} $