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Marbles Bonanza (Posted on 2003-09-08) Difficulty: 4 of 5
You have an empty container, and an infinite number of marbles, each numbered with an integer from 1 to infinity.

At the start of the minute, you put marbles 1 - 10 into the container, then remove one of the marbles and throw it away. You do this again after 30 seconds, then again in 15 seconds, and again in 7.5 seconds. You continuosly repeat this process, each time after half as long an interval as the time before, until the minute is over.

Since this means that you repeated the process an infinite number of times, you have "processed" all your marbles.

How many marbles are in the container at the end of the minute if for every repetition (numbered N)

A. You remove the marble numbered (10 * N)

B. You remove the marble numbered (N)

See The Solution Submitted by levik    
Rating: 3.6154 (13 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Most certainly not Zero. | Comment 78 of 87 |
(In reply to Most certainly not Zero. by David Bernat)

Haha, I loved your post so I'll reply to it instead of making my own :)

Okay, here's my theory. According to the latest scientific theories, time comes in packets. Time is not a constant flow. and therefore a minute can only be broken up into a finite number of parts. It follows that one can only remove a finite number of marbles from the jar in a finite amount of time (space time continuum). There would then be an infinite amount of marbles left (a smaller infinite though... don't ask) and a finite, but very large number of marbles in the container. The paradox comes from the assumption that it is possible to "treat" an infinite number of marbles in a finite amount of time.

  Posted by thegnome54 on 2006-01-29 21:48:44

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