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

The two lines : x+ay+b, z=cy+d, and x=a'y+b' , z=c'y+d' will be perpendicular if and only if:

A

aa'+bb'+cc'=0

B

(a+a')(b+b')+(c+c')=0

C

aa'+cc'+1=0

D

aa'+bb'+cc'+1=0

Text Solution

Verified by Experts

The correct Answer is:
C
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