Two stars of mass m1 and m2 are parts of...

Two stars of mass `m_1` and `m_2` are parts of a binary system. The radii of their orbits are `r_1` and `r_2` respectively. Measured from the C.M. of the system. The magnitude of gravitational force `m_1` exerts on `m_2` is

`(m_1 m_2 G)/(r_1 + r_2)^2`

`(m_1 G)/(r_1 + r_2)^2`

`(m_2 G)/(r_1 + r_2)^2`

`(m_1 + m_2) /(r_1 + r_2)^2`

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