Let a,b,c bet the lengtth of the sides o...

Let a,b,c bet the lengtth of the sides of a triangle (on two of them are equal) and `k in R.` if the roots of the equation` x ^(2) +2 (a+b+c)x + 6k (ab+ bc +ca)=0` are real, then:

`l lt 2/3`

`k gt 2/3`

`k gt 1`

`k lt 1/4`

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