Four paticle of masses m1 = 2 m, m2 = 4 ...

Four paticle of masses `m_1 = 2 m, m_2 = 4 m, m_3 = m and m_4` are placed at four corners of a square. What should be the value of `m_4` so that the centres of mass of all the four particle are exactly at the centre of the square ?

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