If the system of equations \( x+a y=0, a z+y=0 \) and \( \mathrm{ax...

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If the system of equations \( x+a y=0, a z+y=0 \) and \( \mathrm{ax}+\mathrm{z}=0 \) has infinite solutions, then the value of a is
\( \mathrm{P} \)
(1) \( -1 \)
(2) 1
W
(3) 0
(4) No real values
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