The wavelength received by the observer is denoted as $\lambda''$ and is given by the equation:
\[\lambda'' = \frac{v + v_s}{f}\]
We can also express $\lambda''$ as:
\[\lambda'' = \frac{v}{f''}\]
By equating these two expressions, we get:
\[\frac{v}{f''} = \frac{v
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