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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)/(sqrt(2))`

B

`(1)/(sqrt(5))`

C

`(1)/(sqrt(6))`

D

`(1)/(sqrt(3))`

Text Solution

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The correct Answer is:
A
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