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The position vectors of three points are...

The position vectors of three points are `-2veci+3vecj+5veck, veci+2vecj+3veck, 7veci-veck`Show that the three points are collinear

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If the position vectors of three points A, B and Care respectively veci+vecj+3veck , 4veci+vecj+5veck and 7(veci+veck) . Find vec(AB)xxvec(AC) .. Interpret the result geometrically.

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Show that the points whose position vectors are 4veci +5vecj+6veck , 5veci+6vecj+4veck , and 6veci+4vecj +5veck form an equilateral triangle.