Find the value of \( \left|\begin{array}{ccc}y z & z x & x y \\ p & 2 q & 3 r \\...

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Find the value of \( \left|\begin{array}{ccc}y z & z x & x y \\ p & 2 q & 3 r \\ 1 & 1 & 1\end{array}\right| \), where \( x, y, z \) are respectively \( p \) th, \( (2 q) \) th, and \( (3 r) \) th terms of an H.P.
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