Ping-Pong balls on parade (H). This Mindscape is based on the experiment described in the section on adding and removing infinitely many Ping-Pong balls from a barrel. This time, suppose you dump into the barrel 10 Ping-Pong balls numbered 1—10 as before and remove number 1. But next you put in 100 Ping-Pong balls, numbered 11—110, and remove number 2. Then you put in 1000 Ping-Pong balls, numbered 111—1110, and remove number 3, and so on. The question is: How many Ping-Pong balls remain in the barrel after the stopwatch beeps? Infinitely many? Finitely many? Can you name one?
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