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A light rod of length l has two masses $$m_1$$ and $$m_2$$ attatched to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the center of mass is
$$\frac{m_1+m_2}{m_1m_2}l_2$$
$$({m_1+m_2})l_2$$
$$\sqrt{m_1m_2}l_2$$
$$\frac{m_1m_2}{m_1+m_2}l_2$$
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