Here, for the 4 loops in the string
the fundamental frequency , f1 = 120/4
f1 = 30 Hz
Now, for the string
f2 = 2 * f1 = 60 Hz
f3 = 3 * 30 = 90 Hz
f5 = 5 * 30 = 150 Hz
here, the frequencies are 30 Hz , 60 Hz, 90 Hz and 150 Hz
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