Three identicle particle each of mass 1 ...

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.

`(AB+AC)/(2)`

`(AB+BC)/(2)`

`(AC-AB)/(3)`

`(AB+AC)/(3)`

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