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Two stars of masses m and 2m at a distance d rotate about their common center of mass in free space. The period of revolution is:
A) T=(2pi) SQRT[(d^3)/(3Gm)]
B) T=(1/(2pi)) SQRT[(3Gm)/(d^3)]
C) T=(1/(2pi)) SQRT[(d^3)/(3Gm)]
D) T=(2pi) SQRT[(3Gm)/(d^3)]

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