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78. AB is a chord of the parabola y = 4ax. If its equation is y = mx + c and it subtends a

78. AB is a chord of the parabola y = 4ax. If its equation is y = mx + c and it subtends a right angle at the vertex of the parabola, then (a) c = 4 am (c) c = -4 am (b) a = 4 mc (d) a+4 mc=0

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