Probability 2 Question 13
13. In a certain city only two newspapers and are published, it is known that of the city population reads and reads , while reads both and . It is also known that of those who read but not look into advertisements and of those who read but not look into advertisements while of those who read both and look into advertisements. What is the percentage of the population reads an advertisement?
(1984, 4M)
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Answer:
Correct Answer: 13. False
Solution:
- Let
and denote respectively the percentage of city population that reads newspapers and .
Then,
Let
[since,