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A piano duo (two pianos, four hands) is tuning up. When they play their respective middle C notes, a beat pattern is heard at 3

A piano duo (two pianos, four hands) is tuning up. When they play their respective middle C notes, a beat pattern is heard at 3 Hz. One of the pianos is known to be in exact tune(middle C = 256 Hz). What frequency or frequencies might the other piano be playing?

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