Sets Math 123 September 15 Problem solving strategy 7: Draw a diagram
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Elements/members of a set
Subset of a set
Union of sets
Intersection of sets
Difference of sets
Cartesian product of sets
Do not worry too much about this, especially the set-builder notation.
A poll of 100 registered voters designed to find out how voters kept up with current events revealed the following facts:
65 watched the news on TV
39 read the newspaper
39 listened to radio news
20 watched TV news and read the newspaper
27 watched TV news and listened to radio news
9 read the newspaper and listened to radio news
6 watched TV news, read the newspaper and listened to radio news.
How many of the 100 people surveyed kept up with current news by some means other than the three sources listed?
How many of the 100 people read the paper but did not watch the news?
How many of the 100 people used only one of he three sources listed to keep up with current events?