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Answer: 25Hz. 

Frequency at output of a counter = Input frequency/(mod number). 

Frequency at W = 2MHz/25 = 80000 Hz. (Mod 25) 

Frequency at X = 80000Hz/16 = 5000 Hz. (Mod 16) 

Frequency at Y = 5000Hz/25 = 200Hz. (Mod 25) 

Frequency at Z = 200Hz/8 = 25Hz. (Mod 8)

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