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The normal drawn at a point `(at_(1)^(2), 2at_(1))` of the parabola `y^(2)=4ax`meets on the point `(ar_(2)^(2), 2at_(2))` then
A. `t_(1)=2t_(2)`
B. `t_(1)^(2)=2t_(2)`
C. `t_(1)t_(2)=1`
D. none of these

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