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Points A(2, 3, -4), B(1, -2, 3) and C(3, 8, -11) are collinear because the direction ratios of AB and BC are
Aequal in sign only
Bin proportion
Cat right angles
Dall equal to zero
Answer & Solution
Correct answer: B. in proportion
AB has ratios -1, -5, 7 and BC has 2, 10, -14, which are in proportion and share point B.
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