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Three masses each of mass \( m \) are placed at the vertices of an equilateral
\( \mathrm{W} \) triangle \( A B C \) of side \( l \) as shown in figure. The force acting on a mass \( 2 m \) placed at the centroid \( O \) of the triangle is
(a) zero
(b) \( \frac{3 G m^{2}}{l^{2}} \)
(c) \( \frac{5 G m^{2}}{l^{2}} \)
(d) \( \frac{7 G m^{2}}{l^{2}} \)
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