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[" 46.If lines "x=ay+b,z=cy+d" and "x=dy...

[" 46.If lines "x=ay+b,z=cy+d" and "x=dy+b,z=c" ) "],[d" are perpendicular then the value of "ad+cc" is "],[[" (a) "1," (b) "0," (c) "-1," (d) "2]]

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