JEE Math Practice Question
If the lines x = ay + b, z = cy + d and x = a'z + b', y = c'z + d' are perpendicular, then :
- A.ab' + bc' + 1 = 0
- B.cc' + a + a' = 0
- C.bb' + cc' + 1 = 0
- D.aa' + c + c' = 0
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