Vectors A, B and C are such that A.B=0 and Ā.C=0. Then the vector parallel to A is
(1) B and C
(2) A×C
(3) B+C
(4) B×C
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From the given conditions it is clear that the vector A is perpendicular to both B and C. option 4 B×C is perpenducular to both B and C and hence 4 is the correct answer
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