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A , B , Ca n dD are any four points in t...

`A , B , Ca n dD` are any four points in the space, then prove that `| vec A Bxx vec C D+ vec B Cxx vec A D+ vec C Axx vec B D|=4` (area of ` A B C` .)

A

2

B

`(1)/(2)`

C

4

D

`(1)/(4)`

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The correct Answer is:
C
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