show that the points (1, 2,3) (7, 0,1) and (-2, 3,4) are collinear
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let A(1,2,3),B(7,0,1),C(−2,3,4)
Drs of AB=(6,−2,−2)
Drs of AC=(−3,1,1)
Drs of AB=−2×Drs of AC
Hence, ABC are collinear .
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