Problems 31-34
Remember that one set divides the universe into two parts.
In Problem 31, the set of people who are 30 and under is the set, and the set of
people who are over 30 is the complement. Divide the universe into two parts. Then,
draw the set of drivers as a circle overlapping both parts.
In Problem 32, the set of people who are males, and the set of people who are females
is the complement. Divide the universe into two parts. Then, draw the set of
bike riders as a circle overlapping both parts.
In Problem 33, the universe is the set of automobiles.
In Problem 34, the universe is the set of communication devices.
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