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Three particles, each of mass 'm' grams ...

Three particles, each of mass 'm' grams situated at the vertices of an equilateral `DeltaABC` of side 'a' 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 `"g-cm"^2` units will be

A

`2 ma^2`

B

`3/2 ma^2`

C

`3/4 ma^2`

D

`5/4 ma^2`

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