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Three musical notes with frequencies 300 Hz, 400 Hz, and 500 Hz are sounded simultaneously. At which of the following years will the combined sound frequencies be heard simultaneously again?
100, 200, 300, 400 years
200, 300, 400, 500 years
100, 200, 400, 500 years
100, 200, 300, 400, 500 years
(D)
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