A survey is conducted to find out whether people in metropolitan
areas obtain their news from television (Event T), a newspaper
(Event N), or radio (Event R). The results show that 60% of people
get news on television, 60% from newspapers, 50% from radio, 30%
from television and newspapers, 25% from television and radio, 30%
from newspapers and ratio, and 15% from television, newspapers and
radio. a) What is the proportion of those who obtain news from
television, but not...