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Approx 257 quadrillion ways.

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Q: How many way can you arrange 20 books on 2 shelves where no shelve can be empty?
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Store shelves is two words. An example sentence can be "the store shelves were nearly empty".


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Frankly, people are buying it as fast as it is produced. People are concerned that an item will be outlawed, and they will not be able to buy it- so they buy more than they usually do. As a result, the shelves are empty. So when ammo DOES show up, people buy as much as they can get- again, leaving empty shelves. The ammo supply IS slowly improving.


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