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Three identical spheres each of radius R...

Three identical spheres each of radius `R` are placed thouching each other on a horizontal table as shown in figure. The co-ordinates of centre of mass are :
.

A

r, r

B

`r//sqrt(3),r//sqrt(3)`

C

`r,r//sqrt(3)`

D

`( r )/(2),( r )/(sqrt(3))`

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The correct Answer is:
C
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