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The vector (a×b)×(c×d)is

(1)perpendicular to a,b,c and d
(2) parallel tothevectors (a×b)×(c×d)
(3) parallel to the line of intersection of the plane containing a and b and the plane containing c and d
(4) perpendicular to the line of intersection of the plane containing a and b and the plane containing c and d

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