Answer: Logic Lights #139

The lamp is ON. It lights up!

Gate by gate

1. A AND B → ON AND ON = ON
2. C AND D → OFF AND OFF = OFF
3. (A AND B) AND (C AND D) → ON AND OFF = OFF
4. NOT ((A AND B) AND (C AND D)) → NOT OFF = 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
D = False

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

When you run it, it prints:

Is the lamp on? True