\[ \left|\begin{array}{ccc} a+b & a+2 b & a+3 b \\ a+2 b & a+3 b & ...

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\[
\left|\begin{array}{ccc}
a+b & a+2 b & a+3 b \\
a+2 b & a+3 b & a+4 b \\
a+4 b & a+5 b & a+6 b
\end{array}\right|=
\]
\( \mathrm{P} \)
W
(1) \( a^{2}+b^{2}+c^{2}-3 a b c \)
(2) \( 3 \mathrm{ab} \)
(3) \( 3 a+5 b \)
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