6.2) (a) 4-bit binary counter, (b) 3-bit Gray code counter

5.3) (a) Moore machine, (b) Mealy machine

7.3) (a) PROM, (b) EPROM

3.3) F = (x'y + xy')'

4.1) (a) 4-input multiplexer, (b) 3-input decoder

6.1) (a) 4-bit shift register, (b) 3-bit Johnson counter

3.2) F = (x + y)'(x' + y')