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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

`ab' + bc' +1=0`

B

`"bb"' + cc' + 1=0`

C

`aa' + c + c'=0`

D

`"cc"' + a + a'=0`

Text Solution

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The correct Answer is:
C
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