Four forces acting on a particle keep it in equilibrium, then :-

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium?

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium?

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium?

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium? (in newton)

Three forces of magnitude 30, 60 and P Newton acting on a particle and particle is in equilibrium. If the angle between the first two forces is 60^(@) , the value of P is