If A(1,2,3), B(3,7,-2), C(6,7,7) and D(-1,0,- | vedclass

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(B) Let $G_1$ be the centroid of $	riangle ABD$. The coordinates are given by $\left(\frac{1+3-1}{3}, \frac{2+7+0}{3}, \frac{3-2-1}{3}ight) = (1, 3

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$\vec{r}=(1+t) \hat{i}+3 \hat{j}+3 t \hat{k}$

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(B) Let $G_1$ be the centroid of $	riangle ABD$. The coordinates are given by $\left(\frac{1+3-1}{3}, \frac{2+7+0}{3}, \frac{3-2-1}{3}ight) = (1, 3, 0)$.Let $G_2$ be the centroid of $	riangle ACD$. The coordinates are given by $\left(\frac{1+6-1}{3}, \frac{2+7+0}{3}, \frac{3+7-1}{3}ight) = (2, 3, 3)$.The position vectors are $\vec{a} = \hat{i} + 3\hat{j}$ and $\vec{b} = 2\hat{i} + 3\hat{j} + 3\hat{k}$.The vector equation of a line passing through $\vec{a}$ and $\vec{b}$ is $\vec{r} = \vec{a} + t(\vec{b} - \vec{a})$.$\vec{b} - \vec{a} = (2-1)\hat{i} + (3-3)\hat{j} + (3-0)\hat{k} = \hat{i} + 3\hat{k}$.Thus, $\vec{r} = (\hat{i} + 3\hat{j}) + t(\hat{i} + 3\hat{k}) = (1+t)\hat{i} + 3\hat{j} + 3t\hat{k}$.

If $A(1,2,3), B(3,7,-2), C(6,7,7)$ and $D(-1,0,-1)$ are points in a plane, then the vector equation of the line passing through the centroids of $\triangle ABD$ and $\triangle ACD$ is

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