1.

Let a,b and s be the sides of a scalane triangle. IF lamda is a real number such that the roots of the equation x^2+2(a+b+c)x+3 lamda (ab+bc+ca)=0 are real, then the interval in which lamda lies is

Answer»

`(INFTY,4/3)`
`(5/3,infty)`
`(1/3,5/3)`
`(4/3,infty)`

ANSWER :A


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