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Let A=|{:(,0,21,r),(,p,q,-r),(,p,-q,r):}...

Let `A=|{:(,0,21,r),(,p,q,-r),(,p,-q,r):}|=A A^(T)=I_(3)` then |p| is

A

`(1)/(sqrt5)`

B

`(1)/(sqrt3)`

C

`(1)/(sqrt6)`

D

`(1)/(sqrt2)`

Text Solution

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The correct Answer is:
D
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