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A robot arm $PQ$ with end coordinates $P(0,0)$ and $Q(2,5)$ rotates counter clockwise about $P$ in the $XY$ plane by $90^\circ$. The new coordinate pair of the end point Q is

  1. $(−2,5)$
  2. $(−5,2)$
  3. $(−5, −2)$
  4. $(2, −5)$
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