Question 120908
<pre><font size = 4><b>
Suppose you have a Venn diagram showing three sets. 
Call the sets A, B, and C. 

Let's draw three overlapping circles:
  
{{{drawing(400,400,-3,3,-2,4, circle(0,0,1.5),
circle(-1,1.732,1.5), circle(1,1.732,1.5),
locate(-1.5,2,"#1"), locate(-.3,2,"#2"), locate(-.3,1.3,"#3")
locate(-1,1,"#4"), locate(-2.2,3,A), locate(2,3,B),locate(.5,-1.5,C) )}}}

How many regions of the Venn diagram correspond to 
elements that are part of set A? 

Answer: 4

Why so many? 

Answer: count them and you'll see. They are labeled
 #1, #2, #3 and #4 in the figure above.

Edwin</pre>