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If x^(2)+(a-b) x+(1-a-b)=0, a, b in R ha...

If `x^(2)+(a-b) x+(1-a-b)=0, a, b in R` has unequal roots for all values of b, then

A

1)` -1 < a <1`

B

2)`a >1`

C

3)` a < -1`

D

4)0

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B
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