Five-variable K-maps: Which statement correctly describes the structure/usage of a 5-variable Karnaugh map?

Difficulty: Easy

Correct Answer: It is made up of two 4-variable Karnaugh maps.

Explanation:


Introduction / Context:
K-maps extend beyond four variables. For five variables, a common hand technique uses two 4-variable maps, one for the fifth variable at 0 and one for it at 1, with grouping allowed across corresponding cells.


Given Data / Assumptions:

  • We want a practical way to visualize 5-variable functions.
  • Manual simplification methods are acceptable.


Concept / Approach:
By splitting the fifth variable into two “layers,” each layer is a standard 4-variable map. Adjacent cells across the two layers are also eligible for grouping, enabling larger implicants and proper minimization.


Step-by-Step Solution:

Step 1: Create two 4-variable K-maps labeled V=0 and V=1 for the fifth variable V.Step 2: Plot minterms on the appropriate layer.Step 3: Group across layers when corresponding cells are both 1 to form larger implicants.


Verification / Alternative check:
Mapping back to algebra confirms valid implicants and correct simplification.


Why Other Options Are Wrong:

There is no such thing: 5-variable K-maps exist.Only with a computer: Manual two-layer method is standard.2-var + 3-var composition: Not how 5-var K-maps are constructed.Single 32-cell grid only: Two-layer approach is common and equivalent.


Common Pitfalls:
Forgetting cross-layer adjacency, which prevents achieving maximal groups.


Final Answer:
It is made up of two 4-variable Karnaugh maps.

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