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If veca,vecb,vec c are position vector ...

If `veca,vecb,vec c` are position vector of vertices of a triangle ABC, then unit vector perpendicular to its plane is

A

`a xx b+ b xx c+c xx a`

B

`(a xx b+b xx c+c xx a)/(|a xx b+b xx c+ c xx a|)`

C

`(a xx b)(|a xx b|)`

D

None of these

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The correct Answer is:
B
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