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If the points with position vectors $60 \bar i+ 3 \bar j, 40 \bar i-80 \bar j$ and $a \bar i-52 \bar j$ are collinear, then $a = $

\[\begin {array} {1 1} (1)\;-40 & \quad (2)\;-20 \\ (3)\;20 & \quad (4)\;40 \end {array}\]

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(1) -40
answered Nov 7, 2013 by pady_1
 

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