A logic problem by Ricardo Massao Takaoka
Logic
Level
2
I used 12 matches to do:
How many matches do I have to use to do a square.
The answer is 840.
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1 solution
Define Tn to be the no. of match stincks needed for a nXn square. There are (n+1) rows and columns with n matchsticks. So,Tn=2n(n+1) Hence T20=2X20X21=840