In the box it is DQ0Q1Q2Q3.
option is a) 3 b) 4 c) 6 d) 7
As per question we have arrangement as shown in fig .
We have arranged the registers are Q0,Q1,Q2,Q3 input to Q0 is ((Q2 ex-or Q3) Ex-Or Q0)
as per current values we have Q0,Q1,Q2,Q3 as 1000 now ,
Hence in 6th clock we got output as 1000
how can you start with 1000? in question, order is Q3,Q2,Q1,Q0.
if you are taking order as Q0 Q1 Q2 Q3 you should start with 0001.
@Utkarsh Joshi you are correct but why you are taking given condition as clock 1...
Means your clock 1 is already exsisting pattern , no need to count it .