I have three media channels where I can push public health information (tv,
radio and newspaper). Any given citizen can be touched by the information
from one, two or three channels (let's ignore for the moment that citizens
might miss the information all together). Hence these sets:

 library(sets)

 tv <- set(1, 4, 7, 6)
 radio <- set(6, 7, 5, 2)
 newspaper <- set(4, 7, 5, 3)

Now I want to know how many citizens that newspapers bring to the complete
body of informed citizens. E.g. how many people gets the information ONLY
from a newspaper:

 (tv | radio | t) - (tv | radio)

But how do I solve this if I know that

220 people is reached via tv
349 people is reached vi radio
384 people is reached via newspaper

97 people is reached via tv and radio
173 people is reached via radio and newspaper
134 people is reached via newspaper and tv

It's the grey area of the (dummy) plot below that I would like to put a
frequency in

 library(VennDiagram)

 draw.triple.venn(area1 = 10,
   area2 = 10,
   area3 = 10,
   n12 = 3,
   n13 = 3,
   n23 = 3,
   n123 = 1,
   category = c('TV', 'Radio', 'Newspaper'),
   fill = c('white', 'white', 'grey'),
   alpha = c(1, 1, 0)
 )

I don't understand how the frequencies that I know is supposed to be used
in the 'sets' notation. Or am I completely misunderstanding something here?
Wouldn't be the first time if I did...

TIA

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