Exam-style question
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A truth table that includes a column for previous state is characteristic of which type of logic circuit?.
- A.Combinational logic
- B.Sequential logic
- C.Both
- D.Neither
Model answer
What a good answer should say
- Sequential logic
Explanation
Why this works
Define both: a combinational truth table lists outputs for each combination of current inputs only; a sequential truth table also lists outputs for each combination of current inputs and previous state. Identify key difference: inclusion of previous state.
Explain when each applies: combinational tables are used for circuits without memory; sequential tables are used when state must be considered. Conclude: the presence of a previous‑state column indicates a sequential logic circuit.
Common mistake
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