The non zero value of \( a \) for which the lines \( 2 x-y+ \) P \( 3 z+4=0=a x+y-z+2 \) and \...

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The non zero value of \( a \) for which the lines \( 2 x-y+ \)
P \( 3 z+4=0=a x+y-z+2 \) and \( x-3 y+z=0=x+ \)

WW \( 2 \mathrm{y}+\mathrm{z}+1 \) are co-planar is
(1) \( -2 \)
(2) 4
(3) 6
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