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Adding Machine

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?

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Circular Circuitry

What will happen when you switch on these circular circuits?

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Not Another NAND!

Prove that you can make any type of logic gate using just NAND gates.

Procedure Solver

Stage: 5 Challenge Level: Challenge Level:1
You will need to experiment with various choices of number. A clear recording system will be necessary.