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Multiple choice

If two distinct chords of the circle $x^{2}+y^{2}-2x-4y=0$ drawn from the point $P(a,\ b)$ are bisected by $x-axis$ then

  1. $(b+2)^{2}> 4a$
  2. $(b-2)^{2}> 4a$
  3. $(b-2)^{2}> 2a$
  4. $(b+2)^{2}> a$
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