\textbf{169.} The sum of the first two harmonics of a string fixed at both ends is 375 Hz. If the length of the string is 40 cm and its mass is 10 grams, the tension in the string is how many newtons?
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(1) $180$ \hspace{1.5cm} (2) $200$ \hspace{1.5cm} (3) $360$ \hspace{1.5cm} (4) $250$
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