If the system of equation \[ 3 x-2 y+z=0, \lambda x-14 y+15 z=0, x+...

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If the system of equation
\[
3 x-2 y+z=0, \lambda x-14 y+15 z=0, x+2 y+3 z=0
\]
P have a non-trivial solution, then \( \lambda= \)

W
(1) 5
(2) \( -5 \)
(3) \( -29 \)
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