If the position vector of three points are $\vec a-2\vec b+3\vec c, 2\vec a+3\vec b-4\vec c, -7\vec b +10\vec c$, then the three points are
Answer & explanation
Correct answer: option 1
Let P, Q, R be the given points. Then, we have
$\vec{QR} = -2 \vec{PQ}$
Hence, P, Q, R are collinear.