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[" Quo.L and M are two points with position / fectors "2a-b" and in the ratio "2:1" externally."],[" position vector of a point "N" which divides the line segment LM in the ratio "2:1" externally."],[" Q.19.Using vectors,find the area of the triangle "ABC" ,whose vertices are "A(1,2,3),B(2,-1,4)" and "],[C(4,5,-1)" ."]

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