if 1 / (ab') + 1 / (ba') = 0 , then line...

if `1 / (ab') + 1 / (ba') = 0` , then lines ` x/ a + y / b =1` and `x / (b') + y / (a') = 1` are

A

1) Parallel

B

2) Inclined at `60^(@)` to each other

C

3) Perpendicular to each other

D

4) Inclined at `30^(@)` to each other

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The correct Answer is:

C

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