Answer: Logic Lights #122

The lamp is ON. It lights up!

Gate by gate

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

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

When you run it, it prints:

Is the lamp on? True