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this question can be solved using lami's theorem:
Lami's theorem states that if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two forces. Consider three forces A, B, C acting on a particle or rigid body making angles α, β and γ with each other.
here,
Mg/sin 150°=T₁ /sin 120°
Mg/0.5=T₁/√3/2
T₁=Mg√3
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