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Fifty-six tuning forks are arranged in o...

Fifty-six tuning forks are arranged in order of increasing frequencies so that each fork gives 4 beats per second with the next one. The last fork gives the octave of the first. Find the frequency of the first.

A

138 Hz

B

144 Hz

C

132 Hz

D

276 Hz

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The correct Answer is:
B
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