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If ax^(2)+by^(2)+(a+b-4)xy-ax-by-20=0 re...

If `ax^(2)+by^(2)+(a+b-4)xy-ax-by-20=0` represent the circle then its centre is

A

`(1/2,1/2)`

B

`(-1/2,-1/2)`

C

(1, 1)

D

(-1, -1)

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