This is a classic puzzle. I first saw it about 1960. Do not consider physical restraints, your friend has a container of an infinite number of balls, each numbered sequentially. At 11:00 AM, he places balls 1-10 into your box and you throw out ball number 1. At 11:30 AM process is repeated for balls 11-20 and you throw out ball number 2. This continues by halving the time until noon each time and placing the next sequence of balls in your box and you throwing out the next in the sequence. Question: at noon, how many balls are in the box?

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This is a classic puzzle. I first saw it about 1960. Do not consider physical restraints, your friend has a container of an infinite number of balls, each numbered sequentially. At 11:00 AM, he places balls 1-10 into your box and you throw out ball number 1. At 11:30 AM process is repeated for balls 11-20 and you throw out ball number 2. This continues by halving the time until noon each time and placing the next sequence of balls in your box and you throwing out the next in the sequence. Question: at noon, how many balls are in the box?

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