When a certain string is clamped at both ends, the lowest four resonant frequencies are measured...

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When a certain string is clamped at both ends, the lowest four resonant frequencies are measured to be 100,150 , 200 , and \( 250 \mathrm{~Hz} \). One of the resonant frequencies (below \( 200 \mathrm{~Hz} \) ) is missing. What is it?
(A) \( 25 \mathrm{~Hz} \)
(B) \( 50 \mathrm{~Hz} \)
(C) \( 75 \mathrm{~Hz} \)
(D) \( 125 \mathrm{~Hz} \)
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