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A line with direction ratios (1, 2, 2) is perpendicular to the line with ratios:
A(2, 2, 1)
B(2, 1, -2)
C(1, 1, 1)
D(1, 2, 3)
Answer & Solution
Correct answer: B. (2, 1, -2)
Only (2, 1, -2) gives a zero dot product, since 2 + 2 - 4 = 0.
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