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If the straight (a-1)x-by+4=0 is normal ...

If the straight (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

`agt1,blt0`

C

`alt1,blt0`

D

`alt1,bgt0`

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