Show that four points whose position vectors are `6 hat i-7 hat j ,\ 16 i-19 hat j-4 hat k ,\ 3 hat i-6 hat k ,\ 2 hat i-5 hat j+10\ hat k` are coplanar.

Explanation

$$\text{Suppose the four points be} A, B, C, D ,$$
$$ \overrightarrow{\mathrm{OA}}=6 \hat{1}-7 \hat{j}+0 \hat{\mathrm{k}} $$
$$ \overrightarrow{O B}=16 \hat{1}-29 \hat{j}-4 \hat{k} $$
...