a) (2 marks) Draw the state diagram only of synchronous counter goes through the following binary repeated sequence: 0, 1, 3, 7, 6, 4 if an input x equals 1, otherwise it repeated sequence: 1, 7, 0, 3, 4, 6 I b) (3 marks) Design a sequential circuit with two D flip-flops A and B, two inputs x and y, and one output z which is specified by the following next-state and output equations: A(t+1)=x'y+XA B(t+1)=x'B+XA z = B