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

Three identical spheres each of radius .R. are placed touching each ot

1.	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
Answer» `(2R)/(3)` 2R `(5R)/(3)` `(4R)/(3)` ANSWER :B