If \( p \) th, \( q \) th and \( r \) th terms of an H.P. be \( a, ...

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If \( p \) th, \( q \) th and \( r \) th terms of an H.P. be \( a, b, c \)
respectively, then \( \Delta=\left|\begin{array}{ccc}b c & c a & a b \\ p & q & r \\ 1 & 1 & 1\end{array}\right| \) is
(a) \( -1 \)
(b) abcpqr
(c) \( p a+q b+r c \)
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