Number Guessing with Binary Numbers
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This is an example of the kind of problem, "Think of an integer and I will guess it." You need to know about binary numbers to understand the trick.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Number Guessing with Binary Numbers"
http://demonstrations.wolfram.com/NumberGuessingWithBinaryNumbers/
Wolfram Demonstrations Project
Published: March 7 2011