In the reading room of a library, there are 23 reading spots. each reading spot consists of a round table with 9 chairs placed around it. there are some readers such that in each occupied reading spot there are different numbers of readers. if in all there are 36 readers, how many reading spots do not have even a single reader?
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15 Spots are Empty!
8 spots are filled like this - 1,2,3,4,5,6,7,8 adding up to 36 readers
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