Find the Fake Coin You have eight coins. They all look identical, but one is a fake and is slightly lighter than the others. Explain how you can use a balance scale to  determine which coin is the fake in exactly a. three weighings. b. two weighings.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Find the Fake Coin
You have eight coins. They all look
identical, but one is a fake and is slightly lighter than
the others. Explain how you can use a balance scale to 
determine which coin is the fake in exactly
a. three weighings.
b. two weighings.

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