From: Rebekah Bray
To: Teacher2Teacher Service
Date: Jan 20, 2000 at 20:55:16
Subject: Boolean Algebra

Approximately 10 years ago, I attended a math competition and observed a
group of students adding and subtracting numbers like the working process
of a calculator/computer.  They each represented a closed or open switch,
and would turn off or on as they were touched. Their group was sponsored
by IBM (but no one at IBM knows anything about it). I would like the
instructions of how they were able to do this.

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