ISRO Scientist or Engineer Mechanical 2009 Question 78

Question 78

If $$\overline{a} + \overline{b} + \overline{c} = 0$$ and $$|\overline{a}| = 3, |\overline{b}| = 5, |\overline{c}| = 7,$$ then the angle between $$\overline{a}$$ and $$\overline{b}$$ is



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