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

If `A=[(0, 2q, r),(p, q, -r),(p, -q, r)]` and `A A\'=I` then value of `|p|` is equal to (A) `1/sqrt3` (B) `1/sqrt2` (C) `1/sqrt6` (D) `1/sqrt5`

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