Question 752450
<pre>
A' U B U C' 

{a,o}' U {a,e,i} U {e,i,o,u}'

We get rid of the primes ' (complement sets) by replacing 
the set with all the elements in the universal set which 
are NOT in that set:

{e,i,u} U (a,e,i} U {a}

Now U means we put all those elements together in one set:

{a,e,i,u}

Edwin</pre>