solve

Question

Answer 1

3 bit jonson counter ..
initially unset means Q0,Q1,Q2 all are 0..
clock no             Q2 Q1 Q0       decimal equivalent
         0                  0    0    0                        0
         1                  1    0     0                       4
          2                 1     1    0                       6
          3                 1     1    1                       7
           4                0     1    1                       3
           5                0     0    1                       1   
           6                0     0    0                       0

now check options ..
A gives same decimal equivalent(with order) as above..