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Question: n a recent survey a statistician reported the following data...

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n a recent survey, a statistician reported the following data.

18 persons liked brand A.
27 persons liked brand B.
16 persons liked brand C.
12 persons liked brands A and B.
7 persons liked brands A and C.
10 persons liked brands B and C.
3 persons liked all three brands.
4 persons liked none of the three brands.

A truthful statistician was asked to find out how many people were interviewed. What was this statistician's answer?

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