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If the straight line (a-1)x-by+4=0 is no...

If the straight line `(a-1)x-by+4=0` is normal to the hyperbola `xy=1` then which of the following does not hold ?

A

`agt1, bgt0`

B

`agt0,blt0`

C

`alt1,blt0`

D

`alt1,bgt0`

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The correct Answer is:
B, D
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