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A certain triple-star system consists of...

A certain triple-star system consists of two stars, each of mass m, revolving about a central star, mass M, in the same circular orbit. The two stars stay at opposite ends of a diameter of the circular orbit, see figure. Derive an expression for the period of revolution of the stars, the radius of the orbit is r.

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`(4pi r^(3//2))/(sqrt(G(4M+m)))`
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