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The position vector of three particles o...

The position vector of three particles of masses `m_1=1kg`.
`m_2=2kg` and `m_3=3kg` are `r_1=(hati+4hatj+hatk)m`, `r_2=(hati+hatj+hatk)m` and `r_3=(2hatj-hatj-2hatk)m` respectivley. Find the position vector of their centre of mass.

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