Fifty college teachers are surveyed as to their possession of colour TV, VCR and tape recorder. Of them, 22 own colour TV, 15 own VCR and 14 own tape recorders. Nine of these college teachers own exactly two items out of colour TV, VCR and tape recorder; and, one college teacher owns all three. How many of the 50 teachers own none of the three, colour TV, VCR or tape recorder?
Number of people owning exactly 2 articles = 9
Number of people owning exactly 3 articles = 1
Applying AUBUC formula, we get
AUBUC = 22+15+14 - 9 -2*(1)=40
Number of people who do not own any article = 50-40 = 10
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