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Three forces \( P, Q \) and \( R \) are acting on a particle in the plane, the angle between \( P \) and \( Q \) and \( Q \) and \( R \)
\( \mathrm{P} \) are \( 150^{\circ} \) and \( 120^{\circ} \) respectively. Then for equilibrium, forces \( P, Q \) and \( R \) are in the ratio
(A) \( 1: 2: 3 \)
(B) \( 1: 2: \sqrt{3} \)
(C) \( 3: 2: 1 \)
(D) \( \sqrt{3}: 2: 1 \)
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