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Show that the found points A ,B ,C ,D wi...

Show that the found points `A ,B ,C ,D` with position vectors ` vec a , vec b , vec c , vec d` respectively such that 3 ` vec a-2 vec b+5 vec c-6 vec d= vec0` , are coplanar. Also, find the position vector of the point of intersection of the line segments `A C` and `B Ddot`

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