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If x^2 + mx + 1 = 0 and (b-c)x^2 + (c-a)...

If `x^2 + mx + 1 = 0` and `(b-c)x^2 + (c-a)x + (a-b) =0` have both roots common, then

A

`m=-1`

B

`m=2`

C

`m=-2`

D

`b,a,c ` are in AP

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