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Let a, b,c be sides of a triangle. No tw...

Let a, b,c be 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) x + 3 lambda (ab + bc + ca ) = 0` are real , then :

A

`lambda lt (4)/(3)`

B

`lambda gt (5)/(3)`

C

`lambda in ((1)/(3), (5)/(3))`

D

`lambda in ((4)/(3), (5)/(3))`.

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A
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