Answer:
Given points are A(2,
3, 4), B(?1, ?2, 1) and C(5, 8, 7).
Let directions
ratios of lines AB and BC are a1, b1, c1 and c1
and a2, b2, c2
and a2
= 5 ? (?1) = 6, b2 = 8 ? (?2) = 10, c2 = 7 ?1 = 6
Here
Clearly
lines AB and BC
are parallel. But point B common.
points A, B, C
are collinear.
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