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If an X-ray binary consists of a 10-solar-mass star and a neutron star orbiting each other every 20.8 days, what is their average separation? *(Hints: Use the version of Kepler's third law for binary stars, \( M_A + M_B = \frac{a^3}{p^2} \); make sure you express quantities in units of AU, solar masses, and years. Assume the mass of the neutron star is 1.6 solar masses.)*

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