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In given figure, the $J$ and $K$ inputs of all the four Flip-Flips are made high. The frequency of the signal at output $Y$ is

  1. $0.833 \; \mathrm{kHz}$
  2. $1.0 \; \mathrm{kHz}$
  3. $0.91 \; \mathrm{kHz}$
  4. $0.77 \; \mathrm{kHz}$
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