RLC - Series

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In a series RLC circuit $R = 2 k \Omega$, L= 1 H and $C = \frac {1}{400} \mu F$. The resonant frequency is
(a) $2 \times10^4$ Hz
(b) $\frac{1}{\pi} times 10^4$ Hz
(c) $10^4$ Hz
(d) $(2\pi) times 10^4$Hz

Answer is ( )

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