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Show that if n(1) , n(2) , n(3) , n(4) ...

Show that if ` n_(1) , n_(2) , n_(3) , n_(4) ....` are the fundamental frequencies of the segments into which a string is divided by placing a number of bridges below it . The frequency of the string is given by
`(1)/(n) = (1) /(n_(1)) + (1)/(n_(2)) + (1)/(n_(3))+ ...`

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