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If `(vec a xx vec b) xx vec c = vec a xx (vec b xx vec c)`, where `vec a, vec b` and `vec c` are any three vectors such that `vec a. vec b ne 0, vec b . vec c ne 0`, then `vec a` and `vec c` are

A

parallel

B

inclined at an angle of `pi/3` between them

C

inclined at an angle of `pi/6` between them

D

perpendicular

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The correct Answer is:
A
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