20 tuning forks are arranged in series in such a way that each fork gives 3 beats s with the previous one If the last fork is

Question

20 tuning forks are arranged in series in such a way that each fork gives 3 beats s with the previous one If the last fork is one octave lower of first fork then frequency of tenth fork is 187 Hz 3 92 Hz 2 89 Hz 4 84 Hz

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