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If A, B, C, D are four points in space ...

If `A, B, C, D` are four points in space satisfying `bar(AB).bar(CD)=K [|bar (AD)|^2+|bar (BC)|^2-|AC|^2-|BD|^2]` then the value of K is

A

2

B

`1//3`

C

`1//2`

D

1

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The correct Answer is:
C
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