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Two heavenly bodies S1 and S2 not far o...

Two heavenly bodies `S_1 and S_2` not far off from each other are seen to revolve in orbit

A

around their common centre of mass

B

which are orbitrary

C

with `S_1`fixed and `S_2` moving rounds `S_1`

D

with `S_2` fixed and `S_1` moving round `S_2`

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The correct Answer is:
A
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