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If the lines x = ay + b, z = cy + d and x = a'z + b', y = c'z + d' are perpendicular, then : 

(1) cc' + a + a' = 0 

(2) aa' + c + c' = 0 

(3) bb' + cc' + 1 = 0 

(4) ab' + bc' + 1 = 0

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Best answer

The correct option (2) aa' + c + c' = 0   

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