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[" Q.20If "(2,0)" is the vertex and "y" ...

[" Q.20If "(2,0)" is the vertex and "y" -axis is the directrix of a parabola,"],[" then its focus is: "],[[" (a) "(2,0)," (b) "(-2,0)],[" (c) "(4,0)," (d) "(-4,0)]]

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