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## 'Circular Circuitry' printed from http://nrich.maths.org/

Think of a circuit as a flow of electrons. As a switch is flipped
on, electrons flow from the switch. What happens when they reach a
gate? Trace the path of the current around the circuit.

This problem involves the sort of
thinking typically found formally in Decision Mathematics modules,
but can be attempted armed only with a basic understanding of logic
and truth tables.