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CAT 2003 | Question: 1-127

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Each side of a given polygon is parallel to either the X or the Y axis. A corner of such a polygon is said to be convex if the internal angle is $90^{\circ}$ or concanve if the internal angle is $270^{\circ}$. If the number of convex corners in such a polygon is $25,$ the number of concave corners must be

  1. $20$
  2. $0$
  3. $21$
  4. $22$

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