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The two linesax+by=cand a'x+b'y=c' are p...

The two lines`ax+by=cand a'x+b'y=c'` are perpendicular if

A

`aa'+b b'=0`

B

`ab'=ba'`

C

`ab+a'b'=0`

D

`ab'+ba'=0`

Text Solution

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The correct Answer is:
A
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