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A trinary star system which is a system ...

A trinary star system which is a system of three orbiting around centre of mass of system has time peroid of 3 years, while the distance between any two stars of the system is 2 astronomical unit. All the three stars are identical and mass of the sun is M and total mass of this multiple star system is `(a)/(b)xxM` . Then find `(b)/(3)`? (a and b are lowest possible integers (I astronomical unit is equal to distance between sun and earth, time period of rotation of earth around sun is 1year)

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