1.

If r_(1), r_(2), r_(3) are radii of the escribed circles of a triangle ABC and r it the radiusof its incircle, then the root(s) of the equation x^(2)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))x+(r_(1)r_(2)r_(3)-1)=0 is/are :

Answer»

`r_(1)`
`r_(2)+r_(3)`
1
`r_(1)r_(2)r_(3)-1`

Answer :C::D


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