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If `x_1, x_2& x_3` are three distinct numbers which satisfy the relation `(a-1)x^2+(a^2-4a+3)x+(a^2+a-2)=0` then `a=-1` (b) `a=-2` `a=3` (d) None of these

A

`a=-1`

B

`a=-2`

C

`a=3`

D

`a=1`

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