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If the lines x=ay +b, z=cy+d and x=a'y...

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

A

aa' + cc'=1

B

aa' + cc' =-1

C

ab + cd =a'b' + c'd'

D

aa' + bb' = cc' + dd'

Text Solution

Verified by Experts

The correct Answer is:
B
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