If the system of linear equations \[ \begin{array}{l} x+2 a y+a z=0 \\ x+3 b y+b z=0 \\ x+4 c y+...

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If the system of linear equations
\[
\begin{array}{l}
x+2 a y+a z=0 \\
x+3 b y+b z=0 \\
x+4 c y+c z=0
\end{array}
\]
\( \mathrm{P} \)
WV
has a non-zero solution, then a, b, c
(1) are in G.P.
(2) are in H.P.
(3) satisfy a \( +2 b+3 c=0 \)
(4) are in A.P.
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