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If the vectors b, c, d are not coplanar,...

If the vectors b, c, d are not coplanar, then the vector `(axx b)xx(c xx d)+(a xx c)xx(d xx b)+(a xx d)xx(b xx c)` is

A

parallel to a

B

parallel to b

C

parallel to c

D

perpendicular to a

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The correct Answer is:
A
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