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Let a,b,c be the sides of a triangle n...

Let a,b,c be the sides of a triangle no two of them are equal and `lambda in R` if the roots of the equation `x^(2)+2(a+b+c)+3lambda`(ab+bc+ca=0) are real then

A

`lambdalt4/3`

B

`lambdagt5/3`

C

`lambdain(1/3,5/3)`

D

`lambdain(4/3,5/3)`

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A
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