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Three identicle particle each of mass `1 kg` are placed with their centres on a straight line. Their centres are marked `A, B and C` respectively. The distance of centre of mass of the system from `A` is.

A

`(PQ+PR+QR)/(3)`

B

`(PQ+PR)/(3)`

C

`(PQ+QR)/(3)`

D

`(PR+QR)/(3)`

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