Seven orbs: Difference between revisions
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==Puzzle== | ==Puzzle== | ||
You enter a magical cave to find seven orbs. A wizard tells you that each orb is colored on the inside, and that four or more of the orbs have the same color. Also, when two orbs of the same color are brought into contact with each other, they will glow, revealing the color. If two orbs touch but have different color, nothing happens. The orbs are heavy, so you can only touch two at a time. What is the least number of comparisons needed to find one of the orbs of the majority color? | You enter a magical cave to find seven orbs. A wizard tells you that each orb is colored on the inside, and that four or more of the orbs have the same color. Also, when two orbs of the same color are brought into contact with each other, they will glow, revealing the color. If two orbs touch but have different color, nothing happens. The orbs are heavy, so you can only touch two at a time. What is the least number of comparisons needed to find one of the orbs of the majority color? | ||
==Help== | ==Help== | ||
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{{Needs solution}} | {{Needs solution}} | ||
==References== | |||
{{Problem Solving}} | |||
[[Category:Comparison puzzles]] | [[Category:Comparison puzzles]] | ||
[[Category:Cases]] | [[Category:Cases]] | ||
Revision as of 18:26, 7 June 2010
Puzzle
You enter a magical cave to find seven orbs. A wizard tells you that each orb is colored on the inside, and that four or more of the orbs have the same color. Also, when two orbs of the same color are brought into contact with each other, they will glow, revealing the color. If two orbs touch but have different color, nothing happens. The orbs are heavy, so you can only touch two at a time. What is the least number of comparisons needed to find one of the orbs of the majority color?
Help
References
Problem Solving by Thomas DeFranco and Charles Vinsonhaler.