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

Let a,b,c be the sides of a triangle. Now two of them are equal to `lamda epsilon R`. If the roots of the equation `x^(2)+2(a+b+c)x+3lamda(ab+bc+ca)=0` are real then

A

`lamda lt 4/3`

B

`lamda gt 5/3`

C

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

D

`lamda in ((4)/(3), (5)/(3))`

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A
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