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Direction ratios 3, 4, 12 give direction cosines (positive sign)
A1/3, 1/4, 1/12
B3/5, 4/5, 12/5
C3/12, 4/12, 1
D3/13, 4/13, 12/13
Answer & Solution
Correct answer: D. 3/13, 4/13, 12/13
The root of 9 + 16 + 144 is 13, and each ratio is divided by 13.
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