Q.

lf a, b and c are the sides of △ABC such that a≠b≠c and x2−2(a+b+c)x+3λ (ab+bc+ca)=0  has real roots, then

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a

λ<43

b

λ>53

c

λ∈43,53

d

λ∈13,53

answer is A.

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Detailed Solution

since' a,b and c are the sides of a △ABC. ∴    |a−b|
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