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Three identical particles each of same m...

Three identical particles each of same mass are placed touching each other with their centres on a straight line. Their centres are at A, B and C respectively. Then distance of centre of mass of the system from A is

A

`(AB+AC+BC)/(3)`

B

`(AB+AC)/(3)`

C

`(AB+BC)/(3)`

D

`(AC+BC)/(3)`

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The correct Answer is:
B
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