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Three particles, each of mass `m` grams situated at the vertices of an equilateral triangle `AbC` of side `I` cm (as shown in the figure). The moment of inertia of the system about a line `AX` perpendicular to `AB` and in the plane of `ABC`, in gram-cm^2 units will be.
.

A

`(3)/(2)ml^(2)`

B

`(3)/(4)ml^(2)`

C

`2ml^(2)`

D

`(5)/(4)ml^(2)`

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