Question 634061
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Hi,
couple of Examples:
the idea is A(only) + B(only) + A&B + neiher A or B = Total Sample
In this example:  5 + 9 + 3 + 7  would tell us we started witha sample of 24
{{{drawing(300,300,-4,4,-5,4,
rectangle(-4,-1.6,4,4), locate(-2,1.8,5),locate(1.5,1.7,9),
locate(-3.7,-1,7),
 locate(-3.5,2.5,A), locate(-.1,1.8,3),
circle(-sqrt(2),sqrt(2),2),locate(3.5,2.5,B),
circle(sqrt(2),sqrt(2),2))}}}
Three Venn 
{{{drawing(300,300,-5,4,-5,4,
rectangle(-4,-4,4,4), locate(-2,1.8,16),locate(1.5,1.7,10),
locate(-3.7,-1,17),
 locate(-3.5,2.5,T), locate(-.1,2,34),
circle(-sqrt(2),sqrt(2),2),locate(3.5,2.5,C),
circle(sqrt(2),sqrt(2),2),
circle(0,-.5,2),
locate(-.1,-1.1,14),
locate(-.1,1,23),
locate(-1.1,.7,41),
locate(1,.6,27),locate(1.9,-1.1,Z))}}}