Answer
(c)
Work Step by Step
A direction vector for the line through $P=(3,2,1)$ and $Q=(1,1,1)$ is $$\langle 3-1,2-1,1-1 \rangle=\langle 2,1,0 \rangle$$
So the correct answer is (c).
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.2 Vectors in Three Dimensions - Preliminary Questions - Page 658: 4
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