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3.a Three forces P, Q and R are acting o...

3.a Three forces P, Q and R are acting on a particle in a plane, the angle between P and Q is 150 ° and the angle between 0 and R is 120 °. The ratio of P to Q R for equilibrium is - (A) 1: 2: 3 (B) 1: 2: 13 (C) 3: 2: 1 (D) 3: 2: 1

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