Find the coordinates of the point \( R \) which divides the join of...

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Find the coordinates of the point \( R \) which divides the join of \( P(0,0,0) \) and \( Q(4,-1,-2) \) in the ratio \( 1: 2 \) externally and verify that \( P \) is mid-point of segment \( R Q \).
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