Line x + ay =1 cuts the circle x2 + y2 - 4x-2y +1 = 0 at two points A and B such that Chord AB subtends an angle of 90' at origin then sum of
possible values of a is
-1
1
2
4
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Line x + ay =1 cuts the circle x2 + y2 - 4x-2y +1 = 0 at two points A and B such that Chord AB subtends an angle of 90' at origin then sum of
possible values of a is
-1
1
2
4
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