JEE MAIN - Mathematics Hindi (2019 - 9th January Evening Slot - No. 12)
यदि रेखाएँ $$x=a y+\mathrm{b}, z=c y+\mathrm{d}$$ तथा $$x=\mathrm{a}$$' $$z+\mathrm{b}$$', $$y=\mathrm{c}$$' $$z+\mathrm{d}$$' लम्बवत् हैं, तो-
$$\mathrm{ab'+bc'+1=0}$$
$$\mathrm{cc'+a+a'=0}$$
$$\mathrm{bb'+cc'+1=0}$$
$$\mathrm{aa'+c+c'=0}$$
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