MathematicsEasy244×since 2002Q4660Let A = \left( {\matrix{ 0 & {2q} & r \cr p & q & { - r} \cr p & { - q} & r \cr } } \right). If AA^T = I₃, then ∣p∣\left| p \right|∣p∣ is :A12{1 \over {\sqrt 2 }}21B15{1 \over {\sqrt 5 }}51C16{1 \over {\sqrt 6 }}61D13{1 \over {\sqrt 3 }}31Check answerSkip