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'Weekly Problem 24 - 2007' printed from http://nrich.maths.org/

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Which of the following shaded regions has an area different from the other shaded regions?

Five areas on a 3 by 3 grid.

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

 

 

This problem is taken from the UKMT Mathematical Challenges.

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