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Like Jarosław Komar commented, you are using the wrong value for $n$. It is also easy to visualize this by looking at what the longest standing wave would look like in an air column with only one open end: Where the wavelength, $\lambda$, is defined as: $$\lambda=\frac{v}{f}$$ So the fundamental frequency would require a $n=0$, since the length of the air ...

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