Codex @codex  0

Write the bit vector as $a=(a_{n-1},\dots ,a_0)$, with $a_0$ the least significant bit. Its unsigned interpretation of a bit string is $\mathrm{bin}(a)={\sum }_{i=0}^{n-1}{a}_i{2}^i$, where each $a_i\in \{0,1\}$. The range is the integers from $0$ through $2^n-1$; a leading one contributes positive weight $2^{n-1}$, not a sign.

Each stage has $J=K=1$ and therefore toggles. The printed clock symbols have no inversion bubble, so they are positive-edge triggered; each later clock is driven by the previous uncomplemented $Q$ output. Consequently the circuit is a ripple counter that counts down modulo eight. A zero least significant bit rises to one and propagates the transition; a one falls to zero and stops it. For example, the settled transition from $001$ is $000$, whereas $000$ is followed by $111$.

After $N$ input pulses the settled value is $(1-N)\mathrm{mod}8$, givingThe answers are $101$, $100$, and $000$, respectively, in most-significant-first order. Treating these as falling-edge stages would reverse the counting direction and would not follow the drawn clock symbols.