If \( a, b, c \) are positive and are the \( p \) th, \( q \) th an...

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If \( a, b, c \) are positive and are the \( p \) th, \( q \) th and \( r \) th terms respectively of a G.P., then \( \Delta=\left|\begin{array}{lll}\log a & p & 1 \\ \log b & q & 1 \\ \log c & r & 1\end{array}\right| \) is
(a) 0
(b) \( \log (a b c) \)
(c) \( -(p+q+r) \)
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