The formula for equivalent inductance in parallel, $L_{\mathrm{eq}}$, is given by:
\[L_{\mathrm{eq}} = \frac{L_1 \cdot L_2}{L_1 + L_2}\]
For 4mH and 12mH, we get:
\[L_{\mathrm{eq}} = \frac{4 \cdot 12}{4 + 12} = 3 \, \text{mH}\]
For 3mH and 6mH, we
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