You are given 4 matchsticks arrange in the form of a plus sign(as shown in the
figure). Move one and only one of the 4 matchsticks to make a square. You
may not bend or break of the matchstick.
As shown in above diagram, there are four matchsticks, two placed vertically and one horizontally. The solution is to move the bottom vertical matchstick leaving a tiny square in the center of the figure.
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