Thread: The Last Bean Puzzle
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Old 06-28-2010, 10:37 AM   #7
pdurrant
The Grand Mouse 高貴的老鼠
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Quote:
Originally Posted by omk3 View Post
Spoiler:
White.

If you pick two black -> black in pot -1, white the same
If you pick one black one white -> black in pot -1, white the same
If you pick two white -> white -2, black in pot +1

Whatever you do, white beans either stay the same or are reduced by 2. Since their number is odd, there will always be 1 left.
Exactly right and the right reason too. Congratulations.
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