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A robot is standing at the origin of a Cartesian plane. It can only move right or up by one
unit, and the goal is to reach the point (7,7). However, there are some blocked points in the
plane where the robot cannot step on. The blocked points are on (1,2), and (5,6). How many
different paths can the robot take to reach its goal at point (7,7)?

Sagot :

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