When a string of length 'l' is divided into three segments of length $l_{1}$, $l_{2}$ and $l_{3}$, the fundamental frequencies of three segments are $n_{1}$, $n_{2}$ and $n_{3}$ respectively. The original fundamental frequency 'n' of the string is
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Logic Tip: This is similar to calculating equivalent resistance for resistors in parallel, but applied to frequency and length.