Calculus (3rd Edition)

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



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).
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