Two bodies of mass 1 kg and 3 kg have position vectors i +2 j + k and -3 i -2 j + k , respectively. The centre of mass of this system has a position vector :

1. A. - i + j + k
2. B. -2 i +2 k
3. C. -2 i - j + k
4. D. 2 i - j -2 k

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