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OpenStudy (anonymous):
Of 430 consumers polled, some purchase music on CDs, some only download music, and some do both. If 280 people polled purchase CDs and 220 purchase CDs and download music, how many people download music? ill give gold medal?
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OpenStudy (texaschic101):
make a venn diagram
OpenStudy (anonymous):
Number of Consumers = Number who buy CDs + Number who download - number who do both A union B = A + B - (A intersect B)
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