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Flip flop delay and MOD of counter

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A certain JK-FF has propagation delay $t_{pd}=12$ ns. The largest MOD of the counter suc that, the counter can be designed from these FF's which will operate upto 10 MHz will be ______.
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new frequency<=10*10^6
  starting frequency/number of states <=10^7
 10^9/12*x <=10^7
  x <=8.33
 x=8
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