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If A1B1 and A2B2 are two focal chords ...

If `A_1B_1` and `A_2B_2` are two focal chords of the parabola `y^2=4a x ,` then the chords `A_1A_2` and `B_1B_2` intersect on (a)directrix (b) axis (c)tangent at vertex (d) none of these

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