Classify the Boolean expression Y = pM(0, 1, 3, 4): which canonical form does this notation represent?
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APOS
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BSOP
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CHybrid
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Dnone of the above
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ENOR-only representation
Answer
Correct Answer: POS
Explanation
Introduction / Context:Canonical Boolean forms are written either as a Sum of Minterms (SOP) or a Product of Maxterms (POS). Recognizing standard notations helps in translating between forms and using Karnaugh maps or algebraic simplifications.
Given Data / Assumptions:
- The expression is annotated as pM(0, 1, 3, 4).
- Lowercase/uppercase style may vary, but “M” denotes Maxterms.
- No additional variables or don’t-cares provided.
Concept / Approach:
Notation guide: Σm(…) usually denotes a sum of minterms (SOP), while ΠM(…) or pM(…) denotes a product of maxterms (POS). The indices refer to the maxterm numbers for which the output is zero; POS multiplies these maxterms to specify the function compactly.
Step-by-Step Reasoning:
Identify “M” → Maxterms.Product (Π or p) of Maxterms → POS form.Therefore, Y = pM(0,1,3,4) is a Product of Maxterms (POS).Verification / Alternative check:
Standard digital logic texts and tool notations align with this: Σm(…) ↔ SOP; ΠM(…) ↔ POS.
Why Other Options Are Wrong:
- SOP: would be Σm, not ΠM/pM.
- Hybrid / none / NOR-only: not a standard canonical notation interpretation here.
Common Pitfalls:
- Confusing minterm vs. maxterm indices and their meaning (1-output vs. 0-output positions).
- Overlooking that POS lists the zero terms, not the ones.
Final Answer:
POS