7. A B x y A+ B+ z 1

9. Q X Y
Q(t+1) S 1

11. A B TA TB A+ B+ 1

13. A B x A+ B+ 1

22. A B x A+ B+ 1 A B x A+ B+ 1

25. Design a sequential circuit with JK flip flop that counts backwards (111,110,101,100 ) with output 1, and other numbers will go to state 111 with output 0 A B C A+ B+ C+ Y JA KA JB KB Jc Kc 1

26. Design a sequential circuit with JK flip flop for state A, T F
Design a sequential circuit with JK flip flop for state A, T F.F for B and D F.F for C that counts backwards (111,110,101,100,011 and repeats) with output 1, and other numbers will go to state 111 with output 0 A B C A+ B+ C+ Y JA KA TB Dc 1

27. State diagram A B C A+ B+ C+ 1

28. JA KA TB Dc 1 X
A \ BC 00 01 11 10 1 X x
A \ BC 00 01 11 10 x X 1
A \ BC 00 01 11 10 1
A \ BC 00 01 11 10 1