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OpenStudy (anonymous):
How many ways can you purchase 2 CDs if there are 3 to choose from, 4 cassettes if there are 4 to choose from, and 2 DVDs if there are 5 to choose from?
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OpenStudy (aaronq):
2 cds so you either choose 1 and 2, or 2 and 3, or 2 and 3.. so 3 ways
OpenStudy (aaronq):
4 cassettes (who buys cassettes anyways) out of 4? only one way since you have to buy them all
OpenStudy (anonymous):
Is it 30?
OpenStudy (aaronq):
2 dvds out of 5.. so 1 and 2, or 1 and 3, or 1 and 4, or 1 and 5, or 2 and 3, or 2, and 4, or 2 and 5, or 3, and 4, or 3, and 5, or 4 and 5... soo 10
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