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probname); ?>
Topic Classification: nid, "Topic Classification"); ?> Tags: nid, "Problem Tag");?>
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Supplies: nid, "Supplies"); ?> Pedagogy: nid, "Pedagogy"); ?>
Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
1-2
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Solution: nid, "Solution"); ?>
Problem

Suppose we have a balance (i.e. a scale with two arms, which can only tell us whether the items place on one arm weigh less than or more than the items place on the other arm). We are given 9 coins, one of which is counterfeit and weighs more than its real counterparts. Using only two weighings, is it possible to determine which of the 9 coins is counterfeit? Suppose instead we start with 10 coins; is it now possible to determine which is counterfeit in only two weighings?

Details
Contributer: Brandy
Source Title: Oakland/ East Bay Math Circle - Sept 17, 2007
Authors
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References
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Problem Sets This Problem Belongs to:
parent_nid; ?> Set:
VARIABLES
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DEFINITIONS
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