What term refers to a formula that uses gates to express a logic function?

• A. Logic circuit
• B. Logic expression
• C. Truth table
• D. Low-level language

Answer: (B)

A logic expression is a formula built from boolean variables and operations like AND, OR, and NOT that describes how to combine inputs to produce the output. This symbolic form directly expresses the function and can be translated into a circuit made of gates, since each operation corresponds to a type of gate. A logic circuit, in contrast, is the actual hardware arrangement of gates, not just a formula. A truth table lists all input-output results without providing a compact rule, and a low-level language is about sequences of instructions rather than a direct boolean formula.