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Dragon Hunting (Posted on 2004-12-10) Difficulty: 3 of 5
Prince Valiant went to fight a 3-headed, 3-tailed dragon.

He has a magic sword that can, in one stroke, chop off either one head, two heads, one tail, or two tails.

This dragon is of a type related to the hydra; if one head is chopped off, a new head grows. In place of one tail, two new tails grow; in place of two tails, one new head grows; if two heads are chopped off, nothing grows.

What is the smallest number of strokes required to chop off all the dragon's heads and tails, thus killing it?

See The Solution Submitted by SilverKnight    
Rating: 3.7778 (9 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): A stroke of genius | Comment 15 of 37 |
(In reply to re: A stroke of genius by owl)

Careful about having three thumbs up:  someone might lop off two of them, and then a middle finger would pop up.
  Posted by Larry on 2004-12-10 22:06:24

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