259.Use vector method only to find the values of a and b if points (2, b, 3), (a, – 5, 1) and ( – 1, 11, 9) are collinear.
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Short Answer Type
260.Find the area of the parallelogram having two adjacent sides OA and OB where O is the origin and the position vectors of A and B are respectively and
Long Answer Type
Short Answer Type
. Also find a unit vector perpendicular to both the vectors. 
and 
where 
and 
are two vectors such that 
and 
find the angle between 
.
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if 
