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Three identical spheres each of radius ....

Three identical spheres each of radius .R. are placed touching each other so that their centres A, B and C lie on a straight line. The position of their centre of mass from A is

A

`(2R)/(3)`

B

2R

C

`(5R)/(3)`

D

`(4R)/(3)`

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The correct Answer is:
B
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