AP and TS EAMCET Engineering Model Paper 15

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Question : 67 of 160
 
Marks: +1, -0
If the circle x2+y2+8x−4y+c=0 touches the circle x2+y2+2x+4y−11=0 externally and cuts the circle x2+y2−6x+8y+k=0 orthogonally then k =
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