TS EAMCET 2015 Solved Paper

Section: Mathematics
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Question : 30 of 160
 
Marks: +1, -0
The line x+y=k meets the pairs of straight lines x2+y2−2x−4y+2=0 in two points A and B.If O is the origin and ∠AOB=90° then the value of k>1 is
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