42. Vectors A, B and C are such that AB=0 and
A.C=0. Then the vector parallel to A is
(1) B and C
(2) AXB
(3) B+C
(4) B*C
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that Means the angle between a and b is 90 degree. The angle between a and c is also 90 degree. You can imagine that A B and C is in x y and z plane respectively that means the the parallel vector of A is B and C
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