Let k = 2n. A circuit is built by giving the output of an n-bit binary counter as input to an n-to-2n bit decoder. This circuit is equivalent to a
k-bit binary up counter.
k-bit binary down counter.
k-bit ring counter.
k-bit Johnson counter.
This question is part of this quiz :
Digital Logic & Number representation,GATE-CS-2014-(Set-2),Sequential circuits