Question 468967
given U={10,11,12,13,14,15,16,17,18,19,20}, A={11,13,15,19} & B={10,12,14,15,16,19}
find A' ᑌ B' Show all work on finding A', then B' then the union

<pre>
A' is the set of all elements of U that are not elements of A,

so A' = {10,12,14,16,17,18,20}.

B' is the set of all elements of U that are not elements of B,

so B' = {11,13,17,18,20}.

Therefore 

A' &#5196; B' = {10,12,14,16,17,18,20} &#5196; {11,13,17,18,20}

&#5196; means to get the set of all those elements that are in 
the sets on both sides of the symbol &#5196;, whether they are
in common or not. 

A' &#5196; B' = {10,11,12,13,14,16,17,18,20}

 
Edwin</pre>