If 5 and 7 are the roots of the equation |\table x , 4 , 5 ; 7 , x , 7 ; 5 , 8 , x |=0 then what is the third root?

UPSC NDA I 2011 Mathematics Paper

Question : 5 of 120

Marks: +1, -0

If 5 and 7 are the roots of the equation |

|=0
then what is the third root?

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