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Particles of masses $100\;g$ and $300\;g$ have position vectors $(2 \hat {i}+5 \hat {j}+13 \hat {k})$ and $(-6 \hat i +4 \hat j+2 \hat k).$ Position vector of their center of Mass is

\[\begin {array} {1 1} (a)\;\frac{-16}{4}\hat{i}+\frac{17}{4} \hat{j}+\frac{7}{4} \hat {k} \\ (b)\;\frac{20}{4} \hat{i}+\frac{17}{4} \hat {j}+\frac{7}{4} \hat{k} \\ (c)\;\frac{-16}{4} \hat{i}+\frac{17}{4} \hat {j}+\frac{19}{4} \hat{k} \\ (d)\;\frac{-16}{4} \hat{i}+\frac{13}{4} \hat {j}+\frac{19}{4} \hat{k} \end {array}\]

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