Answer: Logic Lights #104

The lamp is ON. It lights up!

Yellow wires carry power. Grey wires don’t.

Gate by gate

A AND B → ON AND ON = ON
NOT C → NOT OFF = ON
(A AND B) AND NOT C → ON AND ON = ON

The same circuit in Python

Python has the same three gates built in: and, or and not. ON is True and OFF is False.

A = True
B = True
C = False

lamp = (A and B) and not C
print("Is the lamp on?", lamp)

When you run it, it prints:

Is the lamp on? True

Try it: change one of the switches from True to False (or the other way round) and run the code again. Can you find a switch that changes the lamp?

← Back to the puzzle

All Logic Lights

Next puzzle →