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In the sequential circuit shown below, if the initial value of the output $Q_1Q_0$ is $00$. What are the next four values of $Q_1Q_0$?

 

  1. $11$, $10$, $01$, $00$
  2. $10$, $11$, $01$, $00$
  3. $10$, $00$, $01$, $11$
  4. $11$, $10$, $00$, $01$

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