Four chairs are arranged in a circle as shown here... They are designated A, B, C, D. Each chair may have an occupant (logic 1), or may be empty (logic 0). Create both the TTM(..) and Em(...) (Maxterm and Minterm) expressions for the following functions... a) F(D, C, B, A) = 1 iff there are no adjacent empty chairs b) G(D, C, B, A) = 1 iff there are at least 3 adjacent empty chairs c) H(D, C, B, A) = 1 iff there are more people sitting in chairs A, D than in chairs B, C.

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Four chairs are arranged in a circle as shown here...
They are designated A, B, C, D.
Each chair may have an occupant (logic 1),
or may be empty (logic 0).
Create both the |M...) and Em(...)
(Maxterm and Minterm) expressions for
the following functions...
a) F(D, C, B, A) = 1 iff there are no adjacent empty chairs
b) G(D, C, B, A) =1 iff there are at least 3 adjacent empty chairs
c) H(D, C, B, A) = 1 iff there are more people sitting in chairs A, D than in chairs B, C.
Hint: create a truth table of all possibilities and fill it in with the logic from your understanding of
the problem sentence. Then create the minterm and maxterms expressions for each.
Transcribed Image Text:Four chairs are arranged in a circle as shown here... They are designated A, B, C, D. Each chair may have an occupant (logic 1), or may be empty (logic 0). Create both the |M...) and Em(...) (Maxterm and Minterm) expressions for the following functions... a) F(D, C, B, A) = 1 iff there are no adjacent empty chairs b) G(D, C, B, A) =1 iff there are at least 3 adjacent empty chairs c) H(D, C, B, A) = 1 iff there are more people sitting in chairs A, D than in chairs B, C. Hint: create a truth table of all possibilities and fill it in with the logic from your understanding of the problem sentence. Then create the minterm and maxterms expressions for each.
Expert Solution
Step 1

Since A, B, C, D are four variables, so the truth table contain 24 = 16 rows. 

(a) Given F(D, C, B, A) = 1 iff there are no adjacent empty chairs. The truth table is:

A B C F Minterms Maxterms
0 0 0 0 0   (A+B+C+D)
0 0 0 1 0   (A+B+C+D')
0 0 1 0 0   (A+B+C'+D)
0 0 1 1 0   (A+B+C'+D')
0 1 0 0 0   (A+B'+C+D)
0 1 0 1 1 A'BC'D  
0 1 1 0 0   (A+B'+C'+D)
0 1 1 1 1 A'BCD  
1 0 0 0 0   (A'+B+C+D)
1 0 0 1 0   (A'+B+C+D')
1 0 1 0 1 AB'CD'  
1 0 1 1 1 AB'CD  
1 1 0 0 0   (A'+B'+C+D)
1 1 0 1 1 ABC'D  
1 1 1 0 1 ABCD'  
1 1 1 1 1 ABCD  

Now to get desired SOP expression add the minterms for the output 1's.
F=A'BC'D + A'BCD + AB'CD' + AB'CD + ABC'D + ABCD' + ABCD =  (5, 7, 10, 11, 13, 14, 15)

Now to get desired POS expression multiply the maxterms for the output 0's.
F= (A+B+C+D)(A+B+C+D')(A+B+C'+D)(A+B+C'+D')(A+B'+C+D)(A+B'+C'+D)(A'+B+C+D)(A'+B+C+D')(A'+B'+C+D)
 =  (0, 1, 2, 3, 4, 6, 8, 9, 12)

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