$\begin {array} {1 1} (1)\;2 \pi \sqrt {\large\frac{2R}{g}} & \quad (2)\;2 \pi \sqrt{\large\frac{R}{2g}} \\ (3)\;2 \pi \sqrt{\large\frac{R}{3g}} & \quad (4)\;2 \pi \sqrt{ \large\frac{R}{g}} \end {array}$

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