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If the equation x^3+px^2+qx+1=0(p < q) h...

If the equation `x^3+px^2+qx+1=0(p < q)` has only one real root `alpha` then `alpha` belongs to

A

`(-2,-1)`

B

`(-1,0)`

C

`(0,1)`

D

`(1,2)`

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