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A line through points (1, 2, 3) and (4, 6, 8) is parallel to which vector?
A3i + 4j + 5k
B5i + 8j + 11k
Ci + 2j + 3k
D4i + 6j + 8k
Answer & Solution
Correct answer: A. 3i + 4j + 5k
Subtracting the position vectors gives (3, 4, 5), the direction of the join.
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