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