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The two lines x=ay+b,z=cy+d and x=a'y+b'...

The two lines `x=ay+b,z=cy+d and x=a'y+b', z=c'y +d'` are pendicular to each other if

A

aa' + cc' + 1 = 0

B

aa' + cc' = 0

C

aa' + bb' = 0

D

aa' + bb' cc' = 0

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The correct Answer is:
A
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