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Two planes are perpendicular to one anot...

Two planes are perpendicular to one another. One of then contains vectors `vec a` and `vec c` and other contains vectors `vec b` and `vec d` then `(vec a xx vec c) . (vec b xx vec d) =`

A

1

B

0

C

-1

D

None of these

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The correct Answer is:
B
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