If the line \( x-1=0 \) is the directrix of the parabola P \( y^{2}...

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If the line \( x-1=0 \) is the directrix of the parabola
P \( y^{2}-k x+8=0 \), then one of the value of \( k \), is:

W
(1) \( 1 / 8 \)
(2) 8
(3) 4
(4) \( 1 / 4 \)
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