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IF l and m are variable real numbers such that 5l^2-4lm+6m^2+3l=0, then the variable line lx+my=1 always touches a fixed parabola,whose axis is parallel to the X-axis. If ex+f=0 is directrix of the parabola and e,f are prime numbers , then the value of |e-f| is |
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Answer» 2 |
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