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Tool: Coin Problem (tPoW version)
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Description: Use deduction to find the lighter coin.
Technology Type: Java Applet 
Author: National Library of Virtual Manipulatives (Utah State University)
Language: English 
Cost: Does not require payment for use

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Technology PoW: Monedas Falsas
Counterfeit Coins
Courses: Math 5 Logic and set theory
Math 6 Logic and set theory
Math 7 Logic and set theory
Discrete Math Logical Form & Equivalence

Comment:Description is off, it's the HEAVIER coin that's counterfeit. If you assume the lighter coin then you'll be wrong every time.