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2000 cards (Posted on 2009-01-04) Difficulty: 2 of 5
There are cards labeled from 1 to 2000. The cards are arranged and placed in a pile.

The top card is placed on the table, then the next card at the bottom of the pile.

Then the next card is placed on the table to the right of the first card, and the next card is placed at the bottom of the pile.

This process is continued until all the cards are on the table.

The final order (from left to right) is 1, 2, 3, ... , 2000.

In the original pile, how many cards were above card labeled 1999?

See The Solution Submitted by pcbouhid    
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  Subject Author Date
re(3): computer solution (spoiler)elementofsurprize2009-01-05 22:07:20
re: non-computer solutionCharlie2009-01-05 19:27:42
Solutionnon-computer solutionPaul2009-01-05 17:39:13
re(2): computer solution (spoiler)Charlie2009-01-05 10:05:50
re(2): computer solution (spoiler)Charlie2009-01-05 01:35:10
re: computer solution (spoiler)elementofsurprize2009-01-04 20:09:04
Another Computer Spoilerelementofsurprize2009-01-04 19:36:38
Tracing the cardsGamer2009-01-04 18:06:51
Solutioncomputer solution (spoiler)Charlie2009-01-04 15:04:56
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