Concept explainers
A survey of 300 workers yielded the following information: 231 workers belonged to a union,
and 195 were Democrats. If 172 of the union members were Democrats, how many workers
were in the following situations?
a. belonged to a union or were Democrats
b. belonged to a union but were not Democrats
c. were Democrats but did not belong to a union
d. neither belonged to a union nor were Democrats
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