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A boy plays a cello. On one note, he observes a beat frequency of 12 beats with a 230 Hz tuning fork and a beat

A boy plays a cello. On one note, he observes a beat frequency of 12 beats with a 230 Hz tuning fork and a beat frequency of 8 Hz with a tuning fork of 250 Hz. What is the frequency of the cello?

A. 238 Hz
B. 262 Hz
C. 228 Hz
D. 258 Hz
E. 242 Hz

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