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if we are find qunter sequence with the help of  reverse user defined method  we find 00,01,10,01,10,01,10............

HENCE IT IS MOD 2 COUNTER HENCE THE FREQUENCY f=1/2=.5
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Transition table for given Counter is

Q0 Q1 Q0n Q1n
0 0 1 0
0 1 1 0
1 0 0 1
1 1 0 0

Transition diagram: 00---10---01---10 

It is MOD 2 counter, so it divides the clock frequency by 2

Output is 1/2 = 0.5 MHz 

Hence 0.5 MHz is correct answer

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