Two springs of force constant $K$ and $2K$ are connected to a mass as shown below. The frequency of oscillation of the mass is
  • A$\frac{{3K}}{M}$
  • B$\pi \,\sqrt {\frac{{6M}}{K}} $
  • C$\frac{1}{{2\pi }}\,\sqrt {\frac{{3K}}{M}} $
  • D$\frac{1}{\pi }\,\sqrt {\frac{K}{{6M}}} $
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