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यदि a , b , c एक त्रिभुज की भुजाएँ इस प्रकार है कि ` x^(2)-2(a+b+c)x+ 3 lambda (ab+bc+ca)` के मूल वास्तविक है तब -

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यदि a , b , c एक त्रिभुज की भुजाएँ इस प्रकार है कि ` x^(2)-2(a+b+c)x+ 3 lambda (ab+bc+ca)` के मूल वास्तविक है तब -
A. `lambda lt (4)/(3)`
B. `lambda gt (5)/(3) `
C. `lambda in((4)/(3),(5)/(3))`
D. `lambda in ((1)/(3),(5)/(3))`
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Correct Answer - A
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