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Particles of masses m, 2m, 3m ... nm gra...

 Particles of masses m, 2m, 3m ... nm gram are placed on the same line at distance 1, 21, 31, ..., nl cm from a fixed point. The distance of centre of mass of the particles from the fixed point in cm is

A

`((2n+1)L)/(4)`

B

`(L)/((2n+1))`

C

`(n(n^(2)+1)L)/(2)`

D

`((2n+1)L)/(3)`

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The correct Answer is:
D
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