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Find k so that (1, 2, 3), (2, 4, 5) and (4, 8, k) are collinear.
A7
B8
C9
D11
Answer & Solution
Correct answer: C. 9
Ratios of the first segment are 1, 2, 2 and of the second 3, 6, k - 3, so k - 3 = 6 and k = 9.
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