Let A = ((0,2q,r),(p,q,-r),(p,-q,r)). If...

Let `A = ((0,2q,r),(p,q,-r),(p,-q,r))`. If `A A^(T) = I_(3)`, then `|p|` is

`(1)/(sqrt5)`

`(1)/(sqrt3)`

`(1)/(sqrt6)`

`(1)/(sqrt2)`

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